Simple DTD based Completion Grammar Package

This package implements simple DTD grammar. It means that the grammar can resolve queries by using no document context. It means that if a content model declaration prescribes a sequence and a document already contains starting sequence members the grammar will provide these also because it does not support document context.

This simplification is same as for HTML grammar provided by editor module.

On the other hand there it prepared class {@link ContentModel} that handles it. It is ready to be integrated.