Mathias,
Is the part in the quotes in the pick context, thing context, or the agent linkage?
Think about the tables you've created in the past. This one is named "agent" "list" - how have the list expressions worked in the past?
What this does is to auto-generate one more tag that gets added to whatever list expression that's there.
For example, if the Agent for this panel were the Cleric class, cHelpClr, it would make the following modification to the list expression:
SpecSource.cHelpClr & <the list expression>