Shark的文档中叙述如下：
javascriptToolAgent - Executes Java script. If you set application mode to 0 (zero), tool agent will search for a java script file given as applicationName parameter (this file has to be in the class path), and if it founds it, it will try to execute it. Otherwise, it will consider applicationName parameter to be the script itself, and will try to execute it. So far, we defined few java script files that execute simple arithmetic operations, generation of random number, and one that performs waiting.
This tool agent is able to "understand" the extended attributes with the following names:
AppName - value of this attribute should represent the name of script file to execute (this file has to be in class path)
Script - the value of this represents the script to be executed. I.e. this extended attribute in XPDL can be defined as follows:
<ExtendedAttribute Name="Script" Value="c=a-b;"/>
(a, b and c in above text are Formal parameter Ids from XPDL Application definition)