XSLT Extensions
The Extensions button is used to specify the jars and classes that contain extension functions called from the XSLT file of the current transformation scenario. You can use the Add, Edit, and Remove buttons to configure the extensions.
An extension function called from the XSLT file of the current transformation scenario
will
be searched, in the specified extensions, in the order displayed in this dialog box.
To change
the order of the items, select the item to be moved and press the 
Move up or 
Move down buttons.