Prolog

The prolog can contain XML and <!DOCTYPE...> declarations, comments, and processing instructions.

Shortcut menu commands
Import External DTD	Add an eternal DTD to the <!DOCTYPE...> declaration and, at the same time, load the DTD as a template.
Define External DTD	Add an eternal DTD to the <!DOCTYPE...> declaration.
Edit Internal DTD	Add an internal DTD subset to the <!DOCTYPE...> declaration and, at the same time, load the DTD as a template.
Add Comment	Add a comment below. See Comment.
Add Processing Instruction	Add a Processing Instruction. See Processing instruction.