Network Working Group P. Barker
Request for Comments: 1274 S. Kille
University College London
November 1991
The COSINE and Internet X.500 Schema
Status of this Memo
This RFCspecifies an IAB standards track protocol for the Internet
community, and requests discussion and suggestions for improvements.
Please refer to the current edition of the "IAB Official Protocol
Standards" for the standardization state and status of this protocol.
Distribution of this memo is unlimited.
Abstract
This document suggests an X.500 Directory Schema, or Naming
Architecture, for use in the COSINE and Internet X.500 pilots. The
schema is independent of any specific implementation. As well as
indicating support for the standard object classes and attributes, a
large number of generally useful object classes and attributes are
also defined. An appendix to this document includes a machine
processable version of the schema.
This document also proposes a mechanism for allowing the schema to
evolve in line with emerging requirements. Proformas to support this
process are included.
Corrections and additions to the schema should be sent to na-
update@cs.UCl.ac.uk list, as described within.
1. Introduction
Directory Services are a fundamental requirement of both human and
computer communications' systems. Human users need to be able to
look up various details about other people: for example, telephone
numbers, facsimile numbers and paper mail addresses. Computing
systems also need Directory Services for several purposes: for
example, to support address look-ups for a variety of services, and
to support user-friendly naming and distribution lists in electronic
mail systems.
Directory Services have recently been standardised and published as
the 1988 CCITT X.500 / ISO IS9594 recommendations [1]. The standard
provides a good basis for the provision of real services, and a
considerable amount of Directory Service piloting activity is
currently underway. In the U.S., the PSI White Pages Pilot [4] has
stimulated use of X.500 on the Internet. In Britain, the U.K.
Academic Community Directory Pilot [5] is similarly promoting use of
X.500.
2. Motivation and aims of this document
In a number of areas the X.500 standard only provides a basis for
services. One such area is the Directory's Schema or Naming
Architecture. The standard defines a number of useful object
classes, in X.521, and attribute types, in X.520. These are intended
to be generally useful across a range of directory applications.
However, while these standard definitions are a useful starting
point, they are insufficient as a basis for a large scale pilot
directory.
While it is possible for directory administrators to define their own
sets of additional attribute types and object classes, this is
undesirable for some common attributes and objects. The same objects
and attribute types would be privately defined many times over. This
would result in the directory's generality being diminished as remote
systems would be unable to determine the semantics of these privately
defined data types.
A number of useful additions to the standard definitions were made in
this note's forerunner, "The THORN and RARE Naming Architecture" [2].
These have been heavily used in early X.500 piloting activities.
Furthermore, both the THORN and Quipu X.500 implementations have made
use of these definitions.
Since the afore-mentioned note was issued, a number of further
requirements have come to light as the volume and variety of piloting
activity has increased. Yet further requirements seem likely as the
scale of X.500 pilot services increases. Thus, it is argued that it
is not sufficient to merely reissue an updated version of the
original note. The schema is a "living document" that needs
procedures for:
- Allowing submission of requests for new attributes and
object classes to be added into the schema;
- Allowing groups of object classes and attribute types
defined elsewhere to be integrated into the schema.
- Checking for the redundancy of any previously defined
attribute types and object classes.
This document attempts to establish procedures to allow for the
continual updating of the schema. Two proformas are set out for this
purpose. In addition, descriptive detail is provided for the
additional object classes and attribute types defined in the schema.
These descriptions follow the style used in X.520 and X.521.
Finally, also following the style adopted in the standards documents,
appendices will include the entire schema. Plain text versions of
the document's appendices are intended to be machine processable to
allow derivation of a system's schema tables. Appendix C lists all
the schema's object classes and attribute types in their respective
ASN.1 macro formats.
The scope and intended remit of this coordination activity should be
clearly understood.
- Esoteric and local, highly eXPerimental requirements should
continue to be met by private definitions.
- Requirements which have support from more than one site will
usually be integrated into the schema. Put in other Words,
the tendency will be for the inclusion, as opposed to the
exclusion, of useful additions to the schema.
- An attempt will be made to avoid duplication of object
classes and attribute types for essentially similar real
world objects.
3. What conformance to this schema means
It is not reasonable to require that a DSA which supports this schema
has specific code to handle each of the defined syntaxes. However,
the following requirements are made of a system which claims
conformance to this specification:
1. A DSA shall be able to store all of the attributes and
object class values specified. (Note that this implies
support for all the object classes and attribute types
required by strong authentication as defined in X.509.)
2. A DUA shall be able to identify each attribute type and
object class to the user, with an appropriate representation
(e.g., a string).
3. These statement are qualified for large attributes values
(>1kbyte). A conforming DSA does not have to store such
attribute values, and a DUA does not have to display such
values, although it must indicate their presence.
The following are desirable, but not required:
1. For a DSA to match correctly on the basis of all attribute
syntaxes defined
2. For a DSA to enforce the Object Class schema implied by
these definitions
3. For a DUA to correctly display the attribute values
(syntaxes) defined
4. For DUAs and DSAs to maintain compatibility with a previous
version of the schema.
4. Requesting new object classes and attribute types
This section defines procedures for requesting new object classes and
attribute types to be added to the schema. Proformas for object
classes and attribute types are specified, and examples given of how
to use them. A mechanism for making requests for large groups of new
object classes and attribute types is described in the next section.
As stated earlier, it is anticipated that the schema will evolve
considerably over time. As X.500 is used to support a widening range
of applications, there will be requirements for extensions to the
schema. This document proposes formalising this procedure by
requiring requests for additions to the schema to be submitted as
completed proformas. This stipulation will greatly simplify
subsequent revisions of the schema.
There is one qualification to the above with respect to requests for
modifications to an existing object class. If a modification to an
object class merely involves additional, optional attributes, the
object class will be enhanced as requested. Systems are expected to
be resilient to such changes to the schema. However, requests to
modify an object class, such that the mandatory attribute types
require altering, will not be met. Instead, a new object class will
be created, and the original object class expired following the
scheme described in the next main section.
It is anticipated that most requests for modifications to the schema
will be met without any need for editorial intervention. Sometimes,
however, some discussion between the submitter of a request and the
schema's editor may be required. For example, the editor may have to
judge the relative merits of two very similar requests and, as a
result, one of the parties may not get quite what they want. In
cases such as this where the submitter of a request feels aggrieved
about an editorial decision, the requestor may appeal to a broader
community by explaining their views to the mailing list osi-
ds@cs.ucl.ac.uk. Heed will be paid to any consensus that emerges
from discussions on the schema on this list. If it proves that this
list is used almost solely for discussions on schema issues, a
separate discussion list will be created.
To facilitate the production of the afore-mentioned proformas, tools
are included in Appendix B which will verify that a proforma has been
correctly formatted.
Completed proformas should be mailed to na-update@cs.ucl.ac.uk
4.1. Object Class proforma
This section gives an example, completed proforma for a new object
class, alcoholic drink. A proforma for object class specified in BNF
is included in Appendix A.
Object Class: Alcoholic Drink
Description: The Alcoholic Drink object class is used to define
entries representing intoxicating beverages.
ASN1OCMacro: alcoholicDrink OBJECT-CLASS
SUBCLASS OF drink
MUST CONTAIN {
percentAlcohol}
MAY CONTAIN {
normalServing,
hue}
An object class description consists of three fields, separated by
blank lines. The keywords Object Class, Description and ASN1OCMacro,
and their suffixed colons, must be included exactly as above.
The Object Class field should be used for a textual description of
the object class. This will be at most three or four words.
The Description field should contain some explanatory text about the
intended use of the object class. This can run to a number of lines.
The ASN1OCMacro field should follow the definition of the object
class macro as specified in X.501. The above example shows the main
features. There are many more examples which can studied in the
section defining the Pilot Object Classes.
4.2. Attribute type proforma
This section gives an example completed proforma for a new attribute
type, hue (one of the attribute types in the alcoholic drink object
class).
Attribute Type: Hue
Description: The Hue attribute type specifies the hue of
an object. (Note that a description may run to several
lines.)
OCMust:
OCMay: alcoholicDrink
ASN1ATMacro:hue ATTRIBUTE
WITH ATTRIBUTE SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-hue))
ub-hue INTEGER ::= 256
An attribute type description consists of five fields, separated by
blank lines. The keywords Attribute Type, Description, OCMust, OCMay
and ASN1ATMacro, and their suffixed colons, must be included exactly
as above.
The Attribute Type field should be used for a textual description of
the attribute type. This will be at most three or four words.
The Description field should contain some explanatory text about the
intended use of the attribute type. This can run to a number of
lines.
The OCMust field should contain a comma-separated list of object
classes for which this attribute is mandatory.
The OCMay field should contain a comma-separated list of object
classes for which this attribute is optional.
The ASN1ATMacro field should follow the definition of the attribute
macro as specified in X.501. The above example shows some of the
features. In particular, please note the format for specifying size
constraints.
5. Integrating groups of object classes and attribute types.
This section describes two mechanisms that may be employed to allow
the integration of a substantial number of new object classes and
attribute types into the schema.
The first mechanism allows for the transition of groups of related,
privately defined object classes and attribute types into the schema.
An example of when such a transition might be appropriate is when
some experimental use of the Directory is widely adopted within the
pilot. Such a transition will be made if the following conditions
hold:
- The definitions are well structured: i.e., they are not
scattered over a multiplicity of object identifier suBTrees.
- The definitions are in use at a number of sites, and having
to adopt new object identifiers would be unnecessarily
disruptive.
A second mechanism allows for the allocation of an object subtree for
a group of new definitions. A pilotGroups object identifier has been
defined for this purpose. This method will be suitable for an
experiment requiring a considerable number of new object identifiers
to be defined. This approach allows for flexibility during
experimentation and should simplify both the management and the
coherence of the pilot's object identifiers.
In both cases, the object classes, attribute types and syntaxes
should be defined and described in an RFC. It is suggested that such
documents should follow the style used in this document for object
class and attribute type definitions. A reference will be given in
this schema to the document containing the definitions.
6. Removing "old" object classes and attribute types.
It is also important that object classes and attribute types which
are no longer used or useful are removed from the schema. Some
object classes and attribute types initially defined as pilot
extensions may be included as standard definitions in future versions
of the standard. In such a case, it is important that there should
be a fairly rapid transition to the standard definitions. Another
possibility is that newer, more specific definitions obviate the
original definitions.
Two things are essential. First, it is crucial that "old"
definitions are retired as gracefully as possible. The intention to
retire a definition will be sent to the osi-ds@cs.ucl.ac.uk mail
list. In the absence of objections, the definition will be marked
for expiry with a given expiry date. The definition will remain in
the schema until the expiry date. Users of the schema should ensure
that they make the transition to new, alternative definitions in the
interim.
Second, users of the schema must have the right to argue for the
retention of definitions which they regard as necessary, there being
no other definitions which closely meet their requirements. It is
clearly impossible to lay down hard and fast rules on this point, as
no two instances will ever be quite the same. It is intended that
the refereeing on these matters will be sympathetic! As for requests
for additions, an aggrieved user can "go to arbitration" by
initiating a discussion on the osi-ds@cs.ucl.ac.uk mail list.
7. Object Identifiers
Some additional object identifiers are defined for this schema.
These are also reproduced in Appendix C.
data OBJECT IDENTIFIER ::= {ccitt 9}
pss OBJECT IDENTIFIER ::= {data 2342}
ucl OBJECT IDENTIFIER ::= {pss 19200300}
pilot OBJECT IDENTIFIER ::= {ucl 100}
pilotAttributeType OBJECT IDENTIFIER ::= {pilot 1}
pilotAttributeSyntax OBJECT IDENTIFIER ::= {pilot 3}
pilotObjectClass OBJECT IDENTIFIER ::= {pilot 4}
pilotGroups OBJECT IDENTIFIER ::= {pilot 10}
iA5StringSyntax OBJECT IDENTIFIER ::= {pilotAttributeSyntax 4}
caseIgnoreIA5StringSyntax OBJECT IDENTIFIER ::=
{pilotAttributeSyntax 5}
8. Object Classes
8.1. X.500 standard object classes
A number of generally useful object classes are defined in X.521, and
these are supported. Refer to that document for descriptions of the
suggested usage of these object classes. The ASN.1 for these object
classes is reproduced for completeness in Appendix C.
8.2. X.400 standard object classes
A number of object classes defined in X.400 are supported. Refer to
X.402 for descriptions of the usage of these object classes. The
ASN.1 for these object classes is reproduced for completeness in
Appendix C.
8.3. COSINE/Internet object classes
This section attempts to fuse together the object classes designed
for use in the COSINE and Internet pilot activities. Descriptions
are given of the suggested usage of these object classes. The ASN.1
for these object classes is also reproduced in Appendix C.
8.3.1. Pilot Object
The PilotObject object class is used as a sub-class to allow some
common, useful attributes to be assigned to entries of all other
object classes.
pilotObject OBJECT-CLASS
SUBCLASS OF top
MAY CONTAIN {
info,
photo,
manager,
uniqueIdentifier,
lastModifiedTime,
lastModifiedBy,
dITRedirect,
audio}
::= {pilotObjectClass 3}
8.3.2. Pilot Person
The PilotPerson object class is used as a sub-class of person, to
allow the use of a number of additional attributes to be assigned to
entries of object class person.
pilotPerson OBJECT-CLASS
SUBCLASS OF person
MAY CONTAIN {
userid,
textEncodedORAddress,
rfc822Mailbox,
favouriteDrink,
roomNumber,
userClass,
homeTelephoneNumber,
homePostalAddress,
secretary,
personalTitle,
preferredDeliveryMethod,
businessCategory,
janetMailbox,
otherMailbox,
mobileTelephoneNumber,
pagerTelephoneNumber,
organizationalStatus,
mailPreferenceOption,
personalSignature}
::= {pilotObjectClass 4}
8.3.3. Account
The Account object class is used to define entries representing
computer accounts. The userid attribute should be used for naming
entries of this object class.
account OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
userid}
MAY CONTAIN {
description,
seeAlso,
localityName,
organizationName,
organizationalUnitName,
host}
::= {pilotObjectClass 5}
8.3.4. Document
The Document object class is used to define entries which represent
documents.
document OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
documentIdentifier}
MAY CONTAIN {
commonName,
description,
seeAlso,
localityName,
organizationName,
organizationalUnitName,
documentTitle,
documentVersion,
documentAuthor,
documentLocation,
documentPublisher}
::= {pilotObjectClass 6}
8.3.5. Room
The Room object class is used to define entries representing rooms.
The commonName attribute should be used for naming pentries of this
object class.
room OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
commonName}
MAY CONTAIN {
roomNumber,
description,
seeAlso,
telephoneNumber}
::= {pilotObjectClass 7}
8.3.6. Document Series
The Document Series object class is used to define an entry which
represents a series of documents (e.g., The Request For Comments
papers).
documentSeries OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
commonName}
MAY CONTAIN {
description,
seeAlso,
telephoneNumber,
localityName,
organizationName,
organizationalUnitName}
::= {pilotObjectClass 9}
8.3.7. Domain
The Domain object class is used to define entries which represent DNS
or NRS domains. The domainComponent attribute should be used for
naming entries of this object class. The usage of this object class
is described in more detail in [3].
domain OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
domainComponent}
MAY CONTAIN {
associatedName,
organizationName,
organizationalAttributeSet}
::= {pilotObjectClass 13}
8.3.8. RFC822 Local Part
The RFC822 Local Part object class is used to define entries which
represent the local part of RFC822 mail addresses. This treats this
part of an RFC822 address as a domain. The usage of this object
class is described in more detail in [3].
rFC822localPart OBJECT-CLASS
SUBCLASS OF domain
MAY CONTAIN {
commonName,
surname,
description,
seeAlso,
telephoneNumber,
postalAttributeSet,
telecommunicationAttributeSet}
::= {pilotObjectClass 14}
8.3.9. DNS Domain
The DNS Domain (Domain NameServer) object class is used to define
entries for DNS domains. The usage of this object class is described
in more detail in [3].
dNSDomain OBJECT-CLASS
SUBCLASS OF domain
MAY CONTAIN {
ARecord,
MDRecord,
MXRecord,
NSRecord,
SOARecord,
CNAMERecord}
::= {pilotObjectClass 15}
8.3.10. Domain Related Object
The Domain Related Object object class is used to define entries
which represent DNS/NRS domains which are "equivalent" to an X.500
domain: e.g., an organisation or organisational unit. The usage of
this object class is described in more detail in [3].
domainRelatedObject OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
associatedDomain}
::= {pilotObjectClass 17}
8.3.11. Friendly Country
The Friendly Country object class is used to define country entries
in the DIT. The object class is used to allow friendlier naming of
countries than that allowed by the object class country. The naming
attribute of object class country, countryName, has to be a 2 letter
string defined in ISO 3166.
friendlyCountry OBJECT-CLASS
SUBCLASS OF country
MUST CONTAIN {
friendlyCountryName}
::= {pilotObjectClass 18}
8.3.12. Simple Security Object
The Simple Security Object object class is used to allow an entry to
have a userPassword attribute when an entry's principal object
classes do not allow userPassword as an attribute type.
simpleSecurityObject OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
userPassword }
::= {pilotObjectClass 19}
8.3.13. Pilot Organization
The PilotOrganization object class is used as a sub-class of
organization and organizationalUnit to allow a number of additional
attributes to be assigned to entries of object classes organization
and organizationalUnit.
pilotOrganization OBJECT-CLASS
SUBCLASS OF organization, organizationalUnit
MAY CONTAIN {
buildingName}
::= {pilotObjectClass 20}
8.3.14. Pilot DSA
The PilotDSA object class is used as a sub-class of the dsa object
class to allow additional attributes to be assigned to entries for
DSAs.
pilotDSA OBJECT-CLASS
SUBCLASS OF dsa
MUST CONTAIN {
dSAQuality}
::= {pilotObjectClass 21}
8.3.15. Quality Labelled Data
The Quality Labelled Data object class is used to allow the
assignment of the data quality attributes to subtrees in the DIT.
See [8] for more details.
qualityLabelledData OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
dSAQuality}
MAY CONTAIN {
subtreeMinimumQuality,
subtreeMaximumQuality}
::= {pilotObjectClass 22}
9. Attribute Types
9.1. X.500 standard attribute types
A number of generally useful attribute types are defined in X.520,
and these are supported. Refer to that document for descriptions of
the suggested usage of these attribute types. The ASN.1 for these
attribute types is reproduced for completeness in Appendix C.
9.2. X.400 standard attribute types
The standard X.400 attribute types are supported. See X.402 for full
details. The ASN.1 for these attribute types is reproduced in
Appendix C.
9.3. COSINE/Internet attribute types
This section describes all the attribute types defined for use in the
COSINE and Internet pilots. Descriptions are given as to the
suggested usage of these attribute types. The ASN.1 for these
attribute types is reproduced in Appendix C.
9.3.1. Userid
The Userid attribute type specifies a computer system login name.
userid ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-user-identifier))
::= {pilotAttributeType 1}
9.3.2. Text Encoded O/R Address
The Text Encoded O/R Address attribute type specifies a text encoding
of an X.400 O/R address, as specified in RFC987. The use of this
attribute is deprecated as the attribute is intended for interim use
only. This attribute will be the first candidate for the attribute
expiry mechanisms!
textEncodedORAddress ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-text-encoded-or-address))
::= {pilotAttributeType 2}
9.3.3. RFC822 Mailbox
The RFC822 Mailbox attribute type specifies an electronic mailbox
attribute following the syntax specified in RFC822. Note that this
attribute should not be used for greybook or other non-Internet order
mailboxes.
rfc822Mailbox ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreIA5StringSyntax
(SIZE (1 .. ub-rfc822-mailbox))
::= {pilotAttributeType 3}
9.3.4. Information
The Information attribute type specifies any general information
pertinent to an object. It is recommended that specific usage of
this attribute type is avoided, and that specific requirements are
met by other (possibly additional) attribute types.
info ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-information))
::= {pilotAttributeType 4}
9.3.5. Favourite Drink
The Favourite Drink attribute type specifies the favourite drink of
an object (or person).
favouriteDrink ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-favourite-drink))
::= {pilotAttributeType 5}
9.3.6. Room Number
The Room Number attribute type specifies the room number of an
object. Note that the commonName attribute should be used for naming
room objects.
roomNumber ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-room-number))
::= {pilotAttributeType 6}
9.3.7. Photo
The Photo attribute type specifies a "photograph" for an object.
This should be encoded in G3 fax as explained in recommendation T.4,
with an ASN.1 wrapper to make it compatible with an X.400 BodyPart as
defined in X.420.
IMPORT G3FacsimileBodyPart FROM { mhs-motis ipms modules
information-objects }
photo ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
CHOICE {
g3-facsimile [3] G3FacsimileBodyPart
}
(SIZE (1 .. ub-photo))
::= {pilotAttributeType 7}
9.3.8. User Class
The User Class attribute type specifies a category of computer user.
The semantics placed on this attribute are for local interpretation.
Examples of current usage od this attribute in academia are
undergraduate student, researcher, lecturer, etc. Note that the
organizationalStatus attribute may now often be preferred as it makes
no distinction between computer users and others.
userClass ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-user-class))
::= {pilotAttributeType 8}
9.3.9. Host
The Host attribute type specifies a host computer.
host ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-host))
::= {pilotAttributeType 9}
9.3.10. Manager
The Manager attribute type specifies the manager of an object
represented by an entry.
manager ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
distinguishedNameSyntax
::= {pilotAttributeType 10}
9.3.11. Document Identifier
The Document Identifier attribute type specifies a unique identifier
for a document.
documentIdentifier ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-document-identifier))
::= {pilotAttributeType 11}
9.3.12. Document Title
The Document Title attribute type specifies the title of a document.
documentTitle ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-document-title))
::= {pilotAttributeType 12}
9.3.13. Document Version
The Document Version attribute type specifies the version number of a
document.
documentVersion ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-document-version))
::= {pilotAttributeType 13}
9.3.14. Document Author
The Document Author attribute type specifies the distinguished name
of the author of a document.
documentAuthor ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
distinguishedNameSyntax
::= {pilotAttributeType 14}
9.3.15. Document Location
The Document Location attribute type specifies the location of the
document original.
documentLocation ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-document-location))
::= {pilotAttributeType 15}
9.3.16. Home Telephone Number
The Home Telephone Number attribute type specifies a home telephone
number associated with a person. Attribute values should follow the
agreed format for international telephone numbers: i.e., "+44 71 123
4567".
homeTelephoneNumber ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
telephoneNumberSyntax
::= {pilotAttributeType 20}
9.3.17. Secretary
The Secretary attribute type specifies the secretary of a person.
The attribute value for Secretary is a distinguished name.
secretary ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
distinguishedNameSyntax
::= {pilotAttributeType 21}
9.3.18. Other Mailbox
The Other Mailbox attribute type specifies values for electronic
mailbox types other than X.400 and rfc822.
otherMailbox ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
SEQUENCE {
mailboxType PrintableString, -- e.g. Telemail
mailbox IA5String -- e.g. X378:Joe
}
::= {pilotAttributeType 22}
9.3.19. Last Modified Time
The Last Modified Time attribute type specifies the last time, in UTC
time, that an entry was modified. Ideally, this attribute should be
maintained by the DSA.
lastModifiedTime ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
uTCTimeSyntax
::= {pilotAttributeType 23}
9.3.20. Last Modified By
The Last Modified By attribute specifies the distinguished name of
the last user to modify the associated entry. Ideally, this
attribute should be maintained by the DSA.
lastModifiedBy ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
distinguishedNameSyntax
::= {pilotAttributeType 24}
9.3.21. Domain Component
The Domain Component attribute type specifies a DNS/NRS domain. For
example, "uk" or "ac".
domainComponent ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreIA5StringSyntax
SINGLE VALUE
::= {pilotAttributeType 25}
9.3.22. DNS ARecord
The A Record attribute type specifies a type A (Address) DNS resource
record [6] [7].
aRecord ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
DNSRecordSyntax
::= {pilotAttributeType 26}
9.3.23. MX Record
The MX Record attribute type specifies a type MX (Mail Exchange) DNS
resource record [6] [7].
mXRecord ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
DNSRecordSyntax
::= {pilotAttributeType 28}
9.3.24. NS Record
The NS Record attribute type specifies an NS (Name Server) DNS
resource record [6] [7].
nSRecord ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
DNSRecordSyntax
::= {pilotAttributeType 29}
9.3.25. SOA Record
The SOA Record attribute type specifies a type SOA (Start of
Authority) DNS resorce record [6] [7].
sOARecord ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
DNSRecordSyntax
::= {pilotAttributeType 30}
9.3.26. CNAME Record
The CNAME Record attribute type specifies a type CNAME (Canonical
Name) DNS resource record [6] [7].
cNAMERecord ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
iA5StringSyntax
::= {pilotAttributeType 31}
9.3.27. Associated Domain
The Associated Domain attribute type specifies a DNS or NRS domain
which is associated with an object in the DIT. For example, the entry
in the DIT with a distinguished name "C=GB, O=University College
London" would have an associated domain of "UCL.AC.UK. Note that all
domains should be represented in rfc822 order. See [3] for more
details of usage of this attribute.
associatedDomain ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreIA5StringSyntax
::= {pilotAttributeType 37}
9.3.28. Associated Name
The Associated Name attribute type specifies an entry in the
organisational DIT associated with a DNS/NRS domain. See [3] for
more details of usage of this attribute.
associatedName ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
distinguishedNameSyntax
::= {pilotAttributeType 38}
9.3.29. Home postal address
The Home postal address attribute type specifies a home postal
address for an object. This should be limited to up to 6 lines of 30
characters each.
homePostalAddress ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
postalAddress
MATCHES FOR EQUALITY
::= {pilotAttributeType 39}
9.3.30. Personal Title
The Personal Title attribute type specifies a personal title for a
person. Examples of personal titles are "Ms", "Dr", "Prof" and "Rev".
personalTitle ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-personal-title))
::= {pilotAttributeType 40}
9.3.31. Mobile Telephone Number
The Mobile Telephone Number attribute type specifies a mobile
telephone number associated with a person. Attribute values should
follow the agreed format for international telephone numbers: i.e.,
"+44 71 123 4567".
mobileTelephoneNumber ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
telephoneNumberSyntax
::= {pilotAttributeType 41}
9.3.32. Pager Telephone Number
The Pager Telephone Number attribute type specifies a pager telephone
number for an object. Attribute values should follow the agreed
format for international telephone numbers: i.e., "+44 71 123 4567".
pagerTelephoneNumber ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
telephoneNumberSyntax
::= {pilotAttributeType 42}
9.3.33. Friendly Country Name
The Friendly Country Name attribute type specifies names of countries
in human readable format. The standard attribute country name must
be one of the two-letter codes defined in ISO 3166.
friendlyCountryName ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
::= {pilotAttributeType 43}
9.3.34. Unique Identifier
The Unique Identifier attribute type specifies a "unique identifier"
for an object represented in the Directory. The domain within which
the identifier is unique, and the exact semantics of the identifier,
are for local definition. For a person, this might be an
institution-wide payroll number. For an organisational unit, it
might be a department code.
uniqueIdentifier ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-unique-identifier))
::= {pilotAttributeType 44}
9.3.35. Organisational Status
The Organisational Status attribute type specifies a category by
which a person is often referred to in an organisation. Examples of
usage in academia might include undergraduate student, researcher,
lecturer, etc.
A Directory administrator should probably consider carefully the
distinctions between this and the title and userClass attributes.
organizationalStatus ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-organizational-status))
::= {pilotAttributeType 45}
9.3.36. Janet Mailbox
The Janet Mailbox attribute type specifies an electronic mailbox
attribute following the syntax specified in the Grey Book of the
Coloured Book series. This attribute is intended for the convenience
of U.K users unfamiliar with rfc822 and little-endian mail addresses.
Entries using this attribute MUST also include an rfc822Mailbox
attribute.
janetMailbox ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreIA5StringSyntax
(SIZE (1 .. ub-janet-mailbox))
::= {pilotAttributeType 46}
9.3.37. Mail Preference Option
An attribute to allow users to indicate a preference for inclusion of
their names on mailing lists (electronic or physical). The absence
of such an attribute should be interpreted as if the attribute was
present with value "no-list-inclusion". This attribute should be
interpreted by anyone using the directory to derive mailing lists,
and its value respected.
mailPreferenceOption ATTRIBUTE
WITH ATTRIBUTE-SYNTAX ENUMERATED {
no-list-inclusion(0),
any-list-inclusion(1), -- may be added to any lists
professional-list-inclusion(2)
-- may be added to lists
-- which the list provider
-- views as related to the
-- users professional inter-
-- ests, perhaps evaluated
-- from the business of the
-- organisation or keywords
-- in the entry.
}
::= {pilotAttributeType 47}
9.3.38. Building Name
The Building Name attribute type specifies the name of the building
where an organisation or organisational unit is based.
buildingName ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-building-name))
::= {pilotAttributeType 48}
9.3.39. DSA Quality
The DSA Quality attribute type specifies the purported quality of a
DSA. It allows a DSA manager to indicate the expected level of
availability of the DSA. See [8] for details of the syntax.
dSAQuality ATTRIBUTE
WITH ATTRIBUTE-SYNTAX DSAQualitySyntax
SINGLE VALUE
::= {pilotAttributeType 49}
9.3.40. Single Level Quality
The Single Level Quality attribute type specifies the purported data
quality at the level immediately below in the DIT. See [8] for
details of the syntax.
singleLevelQuality ATTRIBUTE
WITH ATTRIBUTE-SYNTAX DataQualitySyntax
SINGLE VALUE
::= {pilotAttributeType 50}
9.3.41. Subtree Minimum Quality
The Subtree Minimum Quality attribute type specifies the purported
minimum data quality for a DIT subtree. See [8] for more discussion
and details of the syntax.
subtreeMinimumQuality ATTRIBUTE
WITH ATTRIBUTE-SYNTAX DataQualitySyntax
SINGLE VALUE
-- Defaults to singleLevelQuality
::= {pilotAttributeType 51}
9.3.42. Subtree Maximum Quality
The Subtree Maximum Quality attribute type specifies the purported
maximum data quality for a DIT subtree. See [8] for more discussion
and details of the syntax.
subtreeMaximumQuality ATTRIBUTE
WITH ATTRIBUTE-SYNTAX DataQualitySyntax
SINGLE VALUE
-- Defaults to singleLevelQuality
::= {pilotAttributeType 52}
9.3.43. Personal Signature
The Personal Signature attribute type allows for a representation of
a person's signature. This should be encoded in G3 fax as explained
in recommendation T.4, with an ASN.1 wrapper to make it compatible
with an X.400 BodyPart as defined in X.420.
IMPORT G3FacsimileBodyPart FROM { mhs-motis ipms modules
information-objects }
personalSignature ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
CHOICE {
g3-facsimile [3] G3FacsimileBodyPart
}
(SIZE (1 .. ub-personal-signature))
::= {pilotAttributeType 53}
9.3.44. DIT Redirect
The DIT Redirect attribute type is used to indicate that the object
described by one entry now has a newer entry in the DIT. The entry
containing the redirection attribute should be expired after a
suitable grace period. This attribute may be used when an individual
changes his/her place of work, and thus acquires a new organisational
DN.
dITRedirect ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
distinguishedNameSyntax
::= {pilotAttributeType 54}
9.3.45. Audio
The Audio attribute type allows the storing of sounds in the
Directory. The attribute uses a u-law encoded sound file as used by
the "play" utility on a Sun 4. This is an interim format.
audio ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
Audio
(SIZE (1 .. ub-audio))
::= {pilotAttributeType 55}
9.3.46. Publisher of Document
The Publisher of Document attribute is the person and/or organization
that published a document.
documentPublisher ATTRIBUTE
WITH ATTRIBUTE SYNTAX caseIgnoreStringSyntax
::= {pilotAttributeType 56}
9.4. Generally useful syntaxes
caseIgnoreIA5StringSyntax ATTRIBUTE-SYNTAX
IA5String
MATCHES FOR EQUALITY SUBSTRINGS
iA5StringSyntax ATTRIBUTE-SYNTAX
IA5String
MATCHES FOR EQUALITY SUBSTRINGS
-- Syntaxes to support the DNS attributes
DNSRecordSyntax ATTRIBUTE-SYNTAX
IA5String
MATCHES FOR EQUALITY
NRSInformationSyntax ATTRIBUTE-SYNTAX
NRSInformation
MATCHES FOR EQUALITY
NRSInformation ::= SET {
[0] Context,
[1] Address-space-id,
routes [2] SEQUENCE OF SEQUENCE {
Route-cost,
Addressing-info }
}
9.5. Upper bounds on length of attribute values
ub-document-identifier INTEGER ::= 256
ub-document-location INTEGER ::= 256
ub-document-title INTEGER ::= 256
ub-document-version INTEGER ::= 256
ub-favourite-drink INTEGER ::= 256
ub-host INTEGER ::= 256
ub-information INTEGER ::= 2048
ub-unique-identifier INTEGER ::= 256
ub-personal-title INTEGER ::= 256
ub-photo INTEGER ::= 250000
ub-rfc822-mailbox INTEGER ::= 256
ub-room-number INTEGER ::= 256
ub-text-or-address INTEGER ::= 256
ub-user-class INTEGER ::= 256
ub-user-identifier INTEGER ::= 256
ub-organizational-status INTEGER ::= 256
ub-janet-mailbox INTEGER ::= 256
ub-building-name INTEGER ::= 256
ub-personal-signature ::= 50000
ub-audio INTEGER ::= 250000
References
[1] CCITT/ISO, "X.500, The Directory - overview of concepts,
models and services, CCITT /ISO IS 9594.
[2] Kille, S., "The THORN and RARE X.500 Naming Architecture, in
University College London, Department of Computer Science
Research Note 89/48, May 1989.
[3] Kille, S., "X.500 and Domains", RFC1279, University College
London, November 1991.
[4] Rose, M., "PSI/NYSERNet White Pages Pilot Project: Status
Report", Technical Report 90-09-10-1, published by NYSERNet
Inc, 1990.
[5] Craigie, J., "UK Academic Community Directory Service Pilot
Project, pp. 305-310 in Computer Networks and ISDN Systems
17 (1989), published by North Holland.
[6] Mockapetris, P., "Domain Names - Concepts and Facilities",
RFC1034, USC/Information Sciences Institute, November 1987.
[7] Mockapetris, P., "Domain Names - Implementation and
Specification, RFC1035, USC/Information Sciences Institute,
November 1987.
[8] Kille, S., "Handling QOS (Quality of service) in the
Directory," publication in process, March 1991.
APPENDIX A - Object Class and Attribute Type proformas
These are specified in BNF. First some useful definitions, common to
both proformas.
EOL ::= -- the end of line character(s)
BlankLine ::= -- a line consisting solely of an EOL character
String ::= <anychar> <String> <anychar>
anychar ::= --any character occurring in general text, excluding
-- the end of line character
lString ::= <lowercase> <otherstring>
lowercase ::= [a-z]
UString ::= <uppercase> <otherstring>
uppercase ::= [A-Z]
otherstring ::= <otherchar> <otherstring> <otherchar>
otherchar ::= <lowercase> <uppercase> <digit>
Integer ::= <digit> <Integer> <digit>
digit ::= [0-9]
1. Object Class
OCProforma ::= <ObjectClassName> <BlankLine> <Description> <BlankLine> <OCMacro>
ObjectClassName ::= "ObjectClass:" <String> <EOL>
Description ::= "Description:" <DescriptiveText> <EOL>
DescriptiveText ::= <String> <DescriptiveText> <EOL> <String>
OCMacro ::= "ASN1OCMacro:" <ObjectClassMacro>
-- The definition of ObjectClassMacro is adapted from
-- that given in X.501
ObjectClassMacro ::= <OCname> "OBJECT-CLASS" <SubclassOf> <MandatoryAttributes> <OptionalAttributes>
OCName ::= <lString>
SubclassOf ::= "SUBCLASS OF" Subclasses <empty>
Subclasses ::= <Subclass> <Subclass> "," <Subclasses>
Subclass ::= <OCName>
MandatoryAttributes ::= "MUST CONTAIN {" <Attributes> "}" <empty>
OptionalAttributes ::= "MAY CONTAIN {" <Attributes> "}" <empty>
Attributes ::= <AttributeTerm> <AttributeTerm> "," <Attributes>
AttributeTerm ::= <Attribute> <AttributeSet>
Attribute ::= <lString>
AttributeSet ::= <lString>
2. Attribute Type
ATProforma ::= <AttributeTypeName> <BlankLine> <Description> <BlankLine> <OCMust> <Blankline> <OCMay> <BlankLine> <ATMacro>
AttributeTypeName ::= "Attribute Type:" <String> <EOL>
Description ::= "Description:" <DescriptiveText> <EOL>
DescriptiveText ::= <String> <DescriptiveText> <EOL> <String>
OCMust ::= "OCMust:" <OCList> <EOL>
OCList ::= <OCName> <OCList> "," <OCName> <empty>
OCMay ::= "OCMay:" <OCList> <EOL>
ATMacro ::= "ASN1ATMacro:" <AttributeTypeMacro>
-- The definition of AttributeTypeMacro is adapted from that
-- given in X.501
AttributeTypeMacro ::= <ATname> "ATTRIBUTE" <AttributeSyntax> <Multivalued> <empty>
ATName ::= <lString>
AttributeSyntax ::= "WITH ATTRIBUTE SYNTAX" SyntaxChoice
SyntaxChoice ::= <Syntax> <Constraint> <ASN1Type> <MatchTypes>
Syntax ::= <lString>
Constraint ::= "(" ConstraintAlternative ")" <empty>
ConstraintAlternative ::= StringConstraint IntegerConstraint
StringConstraint ::= "SIZE" "(" SizeConstraint ")"
SizeConstraint ::= SingleValue Range
SingleValue ::= <Integer>
Range ::= <Integer> ".." <Integer>
IntegerConstraint ::= Range
ASN1Type ::= <UString>
-- one of ASN.1's base types: e.g. PrintableString,
-- NumericString, etc.
MatchTypes ::= "MATCHES FOR" Matches <empty>
Matches ::= Match Matches Match
Match ::= "EQUALITY" "SUBSTRINGS" "ORDERING"
Multivalued ::= "SINGLE VALUE" "MULTI VALUE" <empty>
APPENDIX B - Format checking tools
This section includes the source for format checking tools for the
two proformas. The tools are written as Bourne shell scripts for
UNIX systems.
1. Object class format checker
sed 's/ *: */:/'
awk '
BEGIN {
state = "initial"
}
/^$/ {
next
}
/^Object Class:/ {
n = index($0, ":")
if (state != "initial")
{
print "Already got object class " oc
print "Got another object class " substr($0, n+1)
state = "notOK"
exit 1
}
oc = substr($0, n+1)
state = "gotOC"
next
}
/^Description:/ {
n = index($0, ":")
if (state != "gotOC")
{
print "Got Description: " substr($0, n+1)
for (i = 0; i < 2 && getline > 0; i++)
print $0
print "..."
if (state == "initial")
print "Expecting Object Class:"
else
print "Expecting ASN1OCMacro:"
state = "notOK"
exit 1
}
while (getline > 0)
if (length($0) > 0)
continue
else
break
state = "gotDesc"
next
}
/^ASN1OCMacro:/ {
n = index($0, ":")
if (state != "gotDesc")
{
print "Got ASN1Macro: " substr($0, n+1)
for (i = 0; i < 2 && getline > 0; i++)
print $0
print "..."
if (state == "initial")
print "Expecting Object Class:"
else
print "Expecting Description:"
state = "notOK"
exit 1
}
state = "OK"
exit 0
}
{
print "Parsing has got confused on seeing line: " $0
state = "notOK"
exit 1
}
END {
if (state == "OK")
print "Input looks OK"
}
2. Attribute Type format checker
sed 's/ *: */:/'
awk '
BEGIN {
state = "initial"
}
/^$/ {
next
}
/^Attribute Type:/ {
n = index($0, ":")
if (state != "initial")
{
got = "Attribute Type:"
exit 1
}
state = "gotAT"
next
}
/^Description:/ {
n = index($0, ":")
if (state != "gotAT")
{
got = "Description:"
exit 1
}
while (getline > 0)
if (length($0) > 0)
continue
else
break
state = "gotDesc"
next
}
/^OCMust:/ {
n = index($0, ":")
if (state != "gotDesc")
{
got = "OCMust:"
exit 1
}
state = "gotOCMust"
next
}
/^OCMay:/ {
n = index($0, ":")
if (state != "gotOCMust")
{
got = "OCMay:"
exit 1
}
state = "gotOCMay"
next
}
/^ASN1ATMacro:/ {
n = index($0, ":")
if (state != "gotOCMay")
{
got = "ASN1ATMacro:"
exit 1
}
state = "OK"
exit 0
}
{
print "Parsing has got confused on seeing line: " $0
state = "notOK"
exit 1
}
END {
if (state == "initial")
print "Expecting Attribute Type:"
else if (state == "gotAT")
print "Expecting Description:"
else if (state == "gotDesc")
print "Expecting OCMust:"
else if (state == "gotOCMust")
print "Expecting OCMay:"
else if (state == "gotOCMay")
print "Expecting ASN1ATMacro:"
if (state != "OK")
print "Got " got
else
print "Input looks OK"
}
APPENDIX C - Summary of all Object Classes and Attribute Types
-- Some Important Object Identifiers
data OBJECT IDENTIFIER ::= {ccitt 9}
pss OBJECT IDENTIFIER ::= {data 2342}
ucl OBJECT IDENTIFIER ::= {pss 19200300}
pilot OBJECT IDENTIFIER ::= {ucl 100}
pilotAttributeType OBJECT IDENTIFIER ::= {pilot 1}
pilotAttributeSyntax OBJECT IDENTIFIER ::= {pilot 3}
pilotObjectClass OBJECT IDENTIFIER ::= {pilot 4}
pilotGroups OBJECT IDENTIFIER ::= {pilot 10}
iA5StringSyntax OBJECT IDENTIFIER ::= {pilotAttributeSyntax 4}
caseIgnoreIA5StringSyntax OBJECT IDENTIFIER ::=
{pilotAttributeSyntax 5}
-- Standard Object Classes
top OBJECT-CLASS
MUST CONTAIN {
objectClass}
::= {objectClass 0}
alias OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
aliasedObjectName}
::= {objectClass 1}
country OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
countryName}
MAY CONTAIN {
description,
searchGuide}
::= {objectClass 2}
locality OBJECT-CLASS
SUBCLASS OF top
MAY CONTAIN {
description,
localityName,
stateOrProvinceName,
searchGuide,
seeAlso,
streetAddress}
::= {objectClass 3}
organization OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
organizationName}
MAY CONTAIN {
organizationalAttributeSet}
::= {objectClass 4}
organizationalUnit OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
organizationalUnitName}
MAY CONTAIN {
organizationalAttributeSet}
::= {objectClass 5}
person OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
commonName,
surname}
MAY CONTAIN {
description,
seeAlso,
telephoneNumber,
userPassword}
::= {objectClass 6}
organizationalPerson OBJECT-CLASS
SUBCLASS OF person
MAY CONTAIN {
localeAttributeSet,
organizationalUnitName,
postalAttributeSet,
telecommunicationAttributeSet,
title}
::= {objectClass 7}
organizationalRole OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
commonName}
MAY CONTAIN {
description,
localeAttributeSet,
organizationalUnitName,
postalAttributeSet,
preferredDeliveryMethod,
roleOccupant,
seeAlso,
telecommunicationAttributeSet}
::= {objectClass 8}
groupOfNames OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
commonName,
member}
MAY CONTAIN {
description,
organizationName,
organizationalUnitName,
owner,
seeAlso,
businessCategory}
::= {objectClass 9}
residentialPerson OBJECT-CLASS
SUBCLASS OF person
MUST CONTAIN {
localityName}
MAY CONTAIN {
localeAttributeSet,
postalAttributeSet,
preferredDeliveryMethod,
telecommunicationAttributeSet,
businessCategory}
::= {objectClass 10}
applicationProcess OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
commonName}
MAY CONTAIN {
description,
localityName,
organizationalUnitName,
seeAlso}
::= {objectClass 11}
applicationEntity OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
commonName,
presentationAddress}
MAY CONTAIN {
description,
localityName,
organizationName,
organizationalUnitName,
seeAlso,
supportedApplicationContext}
::= {objectClass 12}
dSA OBJECT-CLASS
SUBCLASS OF applicationEntity
MAY CONTAIN {
knowledgeInformation}
::= {objectClass 13}
device OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
commonName}
MAY CONTAIN {
description,
localityName,
organizationName,
organizationalUnitName,
owner,
seeAlso,
serialNumber}
::= {objectClass 14}
strongAuthenticationUser OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
userCertificate}
::= {objectClass 15}
certificationAuthority OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
cACertificate,
certificateRevocationList,
authorityRevocationList}
MAY CONTAIN {
crossCertificatePair}
::= {objectClass 16}
-- Standard MHS Object Classes
mhsDistributionList OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
commonName,
mhsDLSubmitPermissions,
mhsORAddresses}
MAY CONTAIN {
description,
organizationName,
organizationalUnitName,
owner,
seeAlso,
mhsDeliverableContentTypes,
mhsdeliverableEits,
mhsDLMembers,
mhsPreferredDeliveryMethods}
::= {mhsObjectClass 0}
mhsMessageStore OBJECT-CLASS
SUBCLASS OF applicationEntity
MAY CONTAIN {
description,
owner,
mhsSupportedOptionalAttributes,
mhsSupportedAutomaticActions,
mhsSupportedContentTypes}
::= {mhsObjectClass 1}
mhsMessageTransferAgent OBJECT-CLASS
SUBCLASS OF applicationEntity
MAY CONTAIN {
description,
owner,
mhsDeliverableContentLength}
::= {mhsObjectClass 2}
mhsOrganizationalUser OBJECT-CLASS
SUBCLASS OF organizationalPerson
MUST CONTAIN {
mhsORAddresses}
MAY CONTAIN {
mhsDeliverableContentLength,
mhsDeliverableContentTypes,
mhsDeliverableEits,
mhsMessageStoreName,
mhsPreferredDeliveryMethods }
::= {mhsObjectClass 3}
mhsResidentialUser OBJECT-CLASS
SUBCLASS OF residentialPerson
MUST CONTAIN {
mhsORAddresses}
MAY CONTAIN {
mhsDeliverableContentLength,
mhsDeliverableContentTypes,
mhsDeliverableEits,
mhsMessageStoreName,
mhsPreferredDeliveryMethods }
::= {mhsObjectClass 4}
mhsUserAgent OBJECT-CLASS
SUBCLASS OF applicationEntity
MAY CONTAIN {
mhsDeliverableContentLength,
mhsDeliverableContentTypes,
mhsDeliverableEits,
mhsORAddresses,
owner}
::= {mhsObjectClass 5}
-- Pilot Object Classes
pilotObject OBJECT-CLASS
SUBCLASS OF top
MAY CONTAIN {
info,
photo,
manager,
uniqueIdentifier,
lastModifiedTime,
lastModifiedBy,
dITRedirect,
audio}
::= {pilotObjectClass 3}
pilotPerson OBJECT-CLASS
SUBCLASS OF person
MAY CONTAIN {
userid,
textEncodedORAddress,
rfc822Mailbox,
favouriteDrink,
roomNumber,
userClass,
homeTelephoneNumber,
homePostalAddress,
secretary,
personalTitle,
preferredDeliveryMethod,
businessCategory,
janetMailbox,
otherMailbox,
mobileTelephoneNumber,
pagerTelephoneNumber,
organizationalStatus,
mailPreferenceOption,
personalSignature}
::= {pilotObjectClass 4}
account OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
userid}
MAY CONTAIN {
description,
seeAlso,
localityName,
organizationName,
organizationalUnitName,
host}
::= {pilotObjectClass 5}
document OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
documentIdentifier}
MAY CONTAIN {
commonName,
description,
seeAlso,
localityName,
organizationName,
organizationalUnitName,
documentTitle,
documentVersion,
documentAuthor,
documentLocation,
documentPublisher}
::= {pilotObjectClass 6}
room OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
commonName}
MAY CONTAIN {
roomNumber,
description,
seeAlso,
telephoneNumber}
::= {pilotObjectClass 7}
documentSeries OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
commonName}
MAY CONTAIN {
description,
seeAlso,
telephoneNumber,
localityName,
organizationName,
organizationalUnitName}
::= {pilotObjectClass 9}
domain OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
domainComponent}
MAY CONTAIN {
associatedName,
organizationName,
organizationalAttributeSet}
::= {pilotObjectClass 13}
rFC822localPart OBJECT-CLASS
SUBCLASS OF domain
MAY CONTAIN {
commonName,
surname,
description,
seeAlso,
telephoneNumber,
postalAttributeSet,
telecommunicationAttributeSet}
::= {pilotObjectClass 14}
dNSDomain OBJECT-CLASS
SUBCLASS OF domain
MAY CONTAIN {
ARecord,
MDRecord,
MXRecord,
NSRecord,
SOARecord,
CNAMERecord}
::= {pilotObjectClass 15}
domainRelatedObject OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
associatedDomain}
::= {pilotObjectClass 17}
friendlyCountry OBJECT-CLASS
SUBCLASS OF country
MUST CONTAIN {
friendlyCountryName}
::= {pilotObjectClass 18}
simpleSecurityObject OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
userPassword }
::= {pilotObjectClass 19}
pilotOrganization OBJECT-CLASS
SUBCLASS OF organization, organizationalUnit
MAY CONTAIN {
buildingName}
::= {pilotObjectClass 20}
pilotDSA OBJECT-CLASS
SUBCLASS OF dsa
MUST CONTAIN {
dSAQuality}
::= {pilotObjectClass 21}
qualityLabelledData OBJECT-CLASS
SUBCLASS OF top
MUST CONTAIN {
dSAQuality}
MAY CONTAIN {
subtreeMinimumQuality,
subtreeMaximumQuality}
::= {pilotObjectClass 22}
-- Standard Attribute Types
objectClass ObjectClass
::= {attributeType 0}
aliasedObjectName AliasedObjectName
::= {attributeType 1}
knowledgeInformation ATTRIBUTE
WITH ATTRIBUTE-SYNTAX caseIgnoreString
::= {attributeType 2}
commonName ATTRIBUTE
WITH ATTRIBUTE-SYNTAX caseIgnoreStringSyntax
(SIZE (1..ub-common-name))
::= {attributeType 3}
surname ATTRIBUTE
WITH ATTRIBUTE-SYNTAX caseIgnoreStringSyntax
(SIZE (1..ub-surname))
::= {attributeType 4}
serialNumber ATTRIBUTE
WITH ATTRIBUTE-SYNTAX printableStringSyntax
(SIZE (1..ub-serial-number))
::= {attributeType 5}
countryName ATTRIBUTE
WITH ATTRIBUTE-SYNTAX PrintableString
(SIZE (1..ub-country-code))
SINGLE VALUE
::= {attributeType 6}
localityName ATTRIBUTE
WITH ATTRIBUTE-SYNTAX caseIgnoreStringSyntax
(SIZE (1..ub-locality-name))
::= {attributeType 7}
stateOrProvinceName ATTRIBUTE
WITH ATTRIBUTE-SYNTAX caseIgnoreStringSyntax
(SIZE (1..ub-state-name))
::= {attributeType 8}
streetAddress ATTRIBUTE
WITH ATTRIBUTE-SYNTAX caseIgnoreStringSyntax
(SIZE (1..ub-street-address))
::= {attributeType 9}
organizationName ATTRIBUTE
WITH ATTRIBUTE-SYNTAX caseIgnoreStringSyntax
(SIZE (1..ub-organization-name))
::= {attributeType 10}
organizationalUnitName ATTRIBUTE
WITH ATTRIBUTE-SYNTAX caseIgnoreStringSyntax
(SIZE (1..ub-organizational-unit-name))
::= {attributeType 11}
title ATTRIBUTE
WITH ATTRIBUTE-SYNTAX caseIgnoreStringSyntax
(SIZE (1..ub-title))
::= {attributeType 12}
description ATTRIBUTE
WITH ATTRIBUTE-SYNTAX caseIgnoreStringSyntax
(SIZE (1..ub-description))
::= {attributeType 13}
searchGuide ATTRIBUTE
WITH ATTRIBUTE-SYNTAX Guide
::= {attributeType 14}
businessCategory ATTRIBUTE
WITH ATTRIBUTE-SYNTAX caseIgnoreStringSyntax
(SIZE (1..ub-business-category))
::= {attributeType 15}
postalAddress ATTRIBUTE
WITH ATTRIBUTE-SYNTAX PostalAddress
MATCHES FOR EQUALITY
::= {attributeType 16}
postalCode ATTRIBUTE
WITH ATTRIBUTE-SYNTAX caseIgnoreStringSyntax
(SIZE (1..ub-postal-code))
::= {attributeType 17}
postOfficeBox ATTRIBUTE
WITH ATTRIBUTE-SYNTAX caseIgnoreStringSyntax
(SIZE (1..ub-post-office-box))
::= {attributeType 18}
physicalDeliveryOfficeName ATTRIBUTE
WITH ATTRIBUTE-SYNTAX caseIgnoreStringSyntax
(SIZE (1..ub-physical-office-name))
::= {attributeType 19}
telephoneNumber ATTRIBUTE
WITH ATTRIBUTE-SYNTAX telephoneNumberSyntax
(SIZE (1..ub-telephone-number))
::= {attributeType 20}
telexNumber ATTRIBUTE
WITH ATTRIBUTE-SYNTAX TelexNumber
(SIZE (1..ub-telex))
::= {attributeType 21}
teletexTerminalIdentifier ATTRIBUTE
WITH ATTRIBUTE-SYNTAX TeletexTerminalIdentifier
(SIZE (1..ub-teletex-terminal-id))
::= {attributeType 22}
facsimileTelephoneNumber ATTRIBUTE
WITH ATTRIBUTE-SYNTAX FacsimileTelephoneNumber
::= {attributeType 23}
x121Address ATTRIBUTE
WITH ATTRIBUTE-SYNTAX NumericString
(SIZE (1..ub-x121-address))
::= {attributeType 24}
internationaliSDNNumber ATTRIBUTE
WITH ATTRIBUTE-SYNTAX NumericString
(SIZE (1..ub-isdn-address))
::= {attributeType 25}
registeredAddress ATTRIBUTE
WITH ATTRIBUTE-SYNTAX PostalAddress
::= {attributeType 26}
destinationIndicator ATTRIBUTE
WITH ATTRIBUTE-SYNTAX PrintableString
(SIZE (1..ub-destination-indicator))
MATCHES FOR EQUALITY SUBSTRINGS
::= {attributeType 27}
preferredDeliveryMethod ATTRIBUTE
WITH ATTRIBUTE-SYNTAX deliveryMethod
::= {attributeType 28}
presentationAddress ATTRIBUTE
WITH ATTRIBUTE-SYNTAX PresentationAddress
MATCHES FOR EQUALITY
::= {attributeType 29}
supportedApplicationContext ATTRIBUTE
WITH ATTRIBUTE-SYNTAX objectIdentifierSyntax
::= {attributeType 30}
member ATTRIBUTE
WITH ATTRIBUTE-SYNTAX distinguishedNameSyntax
::= {attributeType 31}
owner ATTRIBUTE
WITH ATTRIBUTE-SYNTAX distinguishedNameSyntax
::= {attributeType 32}
roleOccupant ATTRIBUTE
WITH ATTRIBUTE-SYNTAX distinguishedNameSyntax
::= {attributeType 33}
seeAlso ATTRIBUTE
WITH ATTRIBUTE-SYNTAX distinguishedNameSyntax
::= {attributeType 34}
userPassword ATTRIBUTE
WITH ATTRIBUTE-SYNTAX Userpassword
::= {attributeType 35}
userCertificate ATTRIBUTE
WITH ATTRIBUTE-SYNTAX UserCertificate
::= {attributeType 36}
cACertificate ATTRIBUTE
WITH ATTRIBUTE-SYNTAX cACertificate
::= {attributeType 37}
authorityRevocationList ATTRIBUTE
WITH ATTRIBUTE-SYNTAX AuthorityRevocationList
::= {attributeType 38}
certificateRevocationList ATTRIBUTE
WITH ATTRIBUTE-SYNTAX CertificateRevocationList
::= {attributeType 39}
crossCertificatePair ATTRIBUTE
WITH ATTRIBUTE-SYNTAX CrossCertificatePair
::= {attributeType 40}
-- Standard MHS Attribute Types
mhsDeliverableContentLength ATTRIBUTE
WITH ATTRIBUTE-SYNTAX integer
::= {mhsAttributeType 0}
mhsDeliverableContentTypes ATTRIBUTE
WITH ATTRIBUTE-SYNTAX oID
::= {mhsAttributeType 1}
mhsDeliverableEits ATTRIBUTE
WITH ATTRIBUTE-SYNTAX oID
::= {mhsAttributeType 2}
mhsDLMembers ATTRIBUTE
WITH ATTRIBUTE-SYNTAX oRName
::= {mhsAttributeType 3}
mhsDLSubmitPermissions ATTRIBUTE
WITH ATTRIBUTE-SYNTAX dLSubmitPermission
::= {mhsAttributeType 4}
mhsMessageStoreName ATTRIBUTE
WITH ATTRIBUTE-SYNTAX dN
::= {mhsAttributeType 5}
mhsORAddresses ATTRIBUTE
WITH ATTRIBUTE-SYNTAX oRAddress
::= {mhsAttributeType 6}
mhsPreferredDeliveryMethods ATTRIBUTE
WITH ATTRIBUTE-SYNTAX deliveryMethod
::= {mhsAttributeType 7}
mhsSupportedAutomaticActions ATTRIBUTE
WITH ATTRIBUTE-SYNTAX oID
::= {mhsAttributeType 8}
mhsSupportedContentTypes ATTRIBUTE
WITH ATTRIBUTE-SYNTAX oID
::= {mhsAttributeType 9}
mhsSupportedOptionalAttributes ATTRIBUTE
WITH ATTRIBUTE-SYNTAX oID
::= {mhsAttributeType 10}
-- Pilot Attribute Types
userid ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-user-identifier))
::= {pilotAttributeType 1}
textEncodedORAddress ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-text-encoded-or-address))
::= {pilotAttributeType 2}
rfc822Mailbox ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreIA5StringSyntax
(SIZE (1 .. ub-rfc822-mailbox))
::= {pilotAttributeType 3}
info ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-information))
::= {pilotAttributeType 4}
favouriteDrink ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-favourite-drink))
::= {pilotAttributeType 5}
roomNumber ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-room-number))
::= {pilotAttributeType 6}
photo ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
CHOICE {
g3-facsimile [3] G3FacsimileBodyPart
}
(SIZE (1 .. ub-photo))
::= {pilotAttributeType 7}
userClass ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-user-class))
::= {pilotAttributeType 8}
host ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-host))
::= {pilotAttributeType 9}
manager ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
distinguishedNameSyntax
::= {pilotAttributeType 10}
documentIdentifier ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-document-identifier))
::= {pilotAttributeType 11}
documentTitle ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-document-title))
::= {pilotAttributeType 12}
documentVersion ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-document-version))
::= {pilotAttributeType 13}
documentAuthor ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
distinguishedNameSyntax
::= {pilotAttributeType 14}
documentLocation ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-document-location))
::= {pilotAttributeType 15}
homeTelephoneNumber ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
telephoneNumberSyntax
::= {pilotAttributeType 20}
secretary ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
distinguishedNameSyntax
::= {pilotAttributeType 21}
otherMailbox ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
SEQUENCE {
mailboxType PrintableString, -- e.g. Telemail
mailbox IA5String -- e.g. X378:Joe
}
::= {pilotAttributeType 22}
lastModifiedTime ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
uTCTimeSyntax
::= {pilotAttributeType 23}
lastModifiedBy ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
distinguishedNameSyntax
::= {pilotAttributeType 24}
domainComponent ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreIA5StringSyntax
SINGLE VALUE
::= {pilotAttributeType 25}
aRecord ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
DNSRecordSyntax
::= {pilotAttributeType 26}
mXRecord ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
DNSRecordSyntax
::= {pilotAttributeType 28}
nSRecord ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
DNSRecordSyntax
::= {pilotAttributeType 29}
sOARecord ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
DNSRecordSyntax
::= {pilotAttributeType 30}
cNAMERecord ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
iA5StringSyntax
::= {pilotAttributeType 31}
associatedDomain ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreIA5StringSyntax
::= {pilotAttributeType 37}
associatedName ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
distinguishedNameSyntax
::= {pilotAttributeType 38}
homePostalAddress ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
postalAddress
MATCHES FOR EQUALITY
::= {pilotAttributeType 39}
personalTitle ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-personal-title))
::= {pilotAttributeType 40}
mobileTelephoneNumber ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
telephoneNumberSyntax
::= {pilotAttributeType 41}
pagerTelephoneNumber ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
telephoneNumberSyntax
::= {pilotAttributeType 42}
friendlyCountryName ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
::= {pilotAttributeType 43}
uniqueIdentifier ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-unique-identifier))
::= {pilotAttributeType 44}
organizationalStatus ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-organizational-status))
::= {pilotAttributeType 45}
janetMailbox ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreIA5StringSyntax
(SIZE (1 .. ub-janet-mailbox))
::= {pilotAttributeType 46}
mailPreferenceOption ATTRIBUTE
WITH ATTRIBUTE-SYNTAX ENUMERATED {
no-list-inclusion(0),
any-list-inclusion(1), -- may be added to any lists
professional-list-inclusion(2)
-- may be added to lists
-- which the list provider
-- views as related to the
-- users professional inter-
-- ests, perhaps evaluated
-- from the business of the
-- organisation or keywords
-- in the entry.
}
::= {pilotAttributeType 47}
buildingName ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
caseIgnoreStringSyntax
(SIZE (1 .. ub-building-name))
::= {pilotAttributeType 48}
dSAQuality ATTRIBUTE
WITH ATTRIBUTE-SYNTAX DSAQualitySyntax
SINGLE VALUE
::= {pilotAttributeType 49}
singleLevelQuality ATTRIBUTE
WITH ATTRIBUTE-SYNTAX DataQualitySyntax
SINGLE VALUE
subtreeMinimumQuality ATTRIBUTE
WITH ATTRIBUTE-SYNTAX DataQualitySyntax
SINGLE VALUE
-- Defaults to singleLevelQuality
::= {pilotAttributeType 51}
subtreeMaximumQuality ATTRIBUTE
WITH ATTRIBUTE-SYNTAX DataQualitySyntax
SINGLE VALUE
-- Defaults to singleLevelQuality
::= {pilotAttributeType 52}
personalSignature ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
CHOICE {
g3-facsimile [3] G3FacsimileBodyPart
}
(SIZE (1 .. ub-personal-signature))
::= {pilotAttributeType 53}
dITRedirect ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
distinguishedNameSyntax
::= {pilotAttributeType 54}
audio ATTRIBUTE
WITH ATTRIBUTE-SYNTAX
Audio
(SIZE (1 .. ub-audio))
::= {pilotAttributeType 55}
documentPublisher ATTRIBUTE
WITH ATTRIBUTE SYNTAX caseIgnoreStringSyntax
::= {pilotAttributeType 56}
-- Generally useful syntaxes
caseIgnoreIA5StringSyntax ATTRIBUTE-SYNTAX
IA5String
MATCHES FOR EQUALITY SUBSTRINGS
iA5StringSyntax ATTRIBUTE-SYNTAX
IA5String
MATCHES FOR EQUALITY SUBSTRINGS
-- Syntaxes to support the DNS attributes
DNSRecordSyntax ATTRIBUTE-SYNTAX
IA5String
MATCHES FOR EQUALITY
NRSInformationSyntax ATTRIBUTE-SYNTAX
NRSInformation
MATCHES FOR EQUALITY
NRSInformation ::= SET {
[0] Context,
[1] Address-space-id,
routes [2] SEQUENCE OF SEQUENCE {
Route-cost,
Addressing-info }
}
-- Upper bounds on length of attribute values
ub-document-identifier INTEGER ::= 256
ub-document-location INTEGER ::= 256
ub-document-title INTEGER ::= 256
ub-document-version INTEGER ::= 256
ub-favourite-drink INTEGER ::= 256
ub-host INTEGER ::= 256
ub-information INTEGER ::= 2048
ub-unique-identifier INTEGER ::= 256
ub-personal-title INTEGER ::= 256
ub-photo INTEGER ::= 250000
ub-rfc822-mailbox INTEGER ::= 256
ub-room-number INTEGER ::= 256
ub-text-or-address INTEGER ::= 256
ub-user-class INTEGER ::= 256
ub-user-identifier INTEGER ::= 256
ub-organizational-status INTEGER ::= 256
ub-janet-mailbox INTEGER ::= 256
ub-building-name INTEGER ::= 256
ub-personal-signature ::= 50000
ub-audio INTEGER ::= 250000
Security Considerations
Security issues are not discussed in this memo.
10. Authors' Addresses
Paul Barker
Department of Computer Science
University College London
Gower Street
London WC1E 6BT
England
Phone: +44 71-380-7366
EMail: P.Barker@cs.ucl.ac.uk
Steve Kille
Department of Computer Science
University College London
Gower Street
London WC1E 6BT
England
Phone: +44 71-380-7294
EMail: S.Kille@cs.ucl.ac.uk
Or send comments to the discussion group: <osi-ds@cs.ucl.ac.uk>.
