The DocBook SGML DTD V4.1 is identified with:
- The public identifier: "-//OASIS//DTD DocBook V4.1//EN", and
- The system identifier: "http://www.oasis-open.org/docbook/sgml/4.1/docbook.dtd"
It is composed of
375 elements, 3053 entities, and 26 notations.
- 375 elements
- 3053 entities
- 917 parameter entities
- 25 external entities
- 978 SDATA entities
- 1133 Marked section entities
- 26 notations
It claims to be an SGML DTD. Element and notation names are not case sensitive. Entity names are case sensitive.