A script wrapper for QDomDocumentFragment. This object represents a tree of DzDomNode objects which are not usually a complete DzDomDocument.
Instances of this object are not constructed directly, rather they are returned by calling DzDomDocument::createDocumentFragment().
The most important feature of this object is the way it is treated by DzDomNode::insertAfter(), DzDomNode::insertBefore(), DzDomNode::replaceChild() and DzDomNode::appendChild(); instead of inserting the fragment itself, all of the fragment's children are inserted.