This is provided by the Java class and also inherits from superclasses. The special 'P' icon represents a Processing Instruction . The disk and wastebasket icons offer one of several ways to edit the tree . Dragging a node to the wastebasket deletes it and its children. New subtrees are imported from disk or clipboard.
Elements can be XML-LINKed.
It has been developed as reusable code and is offered for collaboration. It is extremely flexible and is designed for other DTDs to be added on in specific disciplines. The VHG uses XML to support ISO12620 terminological terminology in the creation of glossaries. XML's addressing and naming schemes allow for distributed glossary servers. And to many virtual colleagues in the SGML community, none of whom I have met.