[Building Sakai] what is "tool.permission" in method getAuthzGroupsIsAllowed() ?

[Hai Vo Thanh]

Dear all,
In the document Sakai Framework Tips > Using the AuthzGroup Service
http://confluence.sakaiproject.org/display/BOOT/Using+the+AuthzGroup+Service

there is a guide: Getting the list of sites that a user has a specific permision in.  The sample code has a line:

java.util.Set authzGroupIds = authzGroupService.getAuthzGroupsIsAllowed(userId, "tool.permission", null); // (1)

Could you please explain me what is the String "tool.permission" ? Can it be replaced by another String?

The prototype of this method is:
Set getAuthzGroupsIsAllowed(String userId, String function, Collection azGroups);
* @param function
*        The function to check.

I am confused about the "String function", i do not know what it really is. Please help me.
Thanks a million.
----
Vo.



      
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