set:difference()
set:difference() returns the difference between two node-sets. In other words, it returns a node-set whose nodes are in one node-set but not in the other.
The template version of set:difference applies templates to these nodes in set:difference mode, copying the nodes so that a result tree fragment consisting of the nodes is returned.
Syntax
set:difference(nodeSet1, nodeSet2)
Parameters
Return value
A node-set containing the nodes that are in nodeSet1 but not in nodeSet2.