/**
* Set the current grouping iterator. This supports the current-group() and current-grouping-key()
* functions in XSLT 2.0
*
* @param collection the new current GroupIterator
*/
public void setCurrentGroupIterator(GroupIterator collection) {
xsltContext = new XSLTContext(xsltContext);
xsltContext.currentGroupIterator = collection;
}
