XSLT Extensions
The Extensions button opens a dialog box that allows you 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.
Tip: 
    You can specify the path to the resources using wildcards (for example,
        
${oxygenHome}/lib/*.jar).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 click the  Move up or
Move up or  Move down buttons.
Move down buttons.
