Big Picture Changes

  • DocBook V5.0 is in the namespace

  • A version attribute is now required on the root element.

  • Element and attribute names are case-sensitive (as they have been in the XML DTD since 4.0).

  • Content models are generally simpler.

  • Uses XLink; allows most inlines to be link elements.

  • Many constraints are now enforced by the grammar. They are not new, but they could not previously be enforced by DTDs.

  • A few simple datatypes are used.

  • Accessibility has been improved with the introduction of alt and annotation tags.