The copy command
Syntax:
copy expressionDeletes everything other than the nodes selected by the expression; returns a new document containing only the selected nodes. Note that if the expression selects multiple elements, the new document will not be a well-formed XML document (it will be a "fragment").
The result of the operation can be inspected using the command show.
Example
The command:
copy //imgreturns a document containing as its children copies of all the img
elements in
the source.