BS ISO/IEC 19757-9:2008

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 DTD extension declarations using XML processing
  instruction syntax
5 DTD extension declarations using XML document
  syntax
6 Location and ordering of DTD extension declarations
7 Inclusion of namespace information in DTDs
  7.1 Associating namespaces with qualified names
  7.2 Associating namespaces with unqualified names
  7.3 Associating namespace constraints with elements with
      content model ANY
8 Inclusion of datatype information in DTDs
  8.1 Associating datatype libraries with qualified datatype
      names
  8.2 Associating datatype libraries with unqualified
      datatype names
9 Validity of DTDs and instances
  9.1 Validity of a DTD that includes extension declarations
  9.2 Validity of an instance whose associated DTD does not
      include extension declarations
  9.3 Validity of an instance whose associated DTD includes
      extension declarations
Annex A (informative) - Example processing model
Annex B (informative) - Example declarations
      B.1 Examples in XML processing instruction syntax
      B.2 Example in XML document syntax

Describes a language that is designed to extend the declarative functionality of an XML DTD to include: - declaring one or more namespaces to which some or all of the element and attribute names in a DTD belong, - declaring constraints on the content of elements with content model ANY to contain elements whose names belong to one or more specified namespaces, - declaring datatypes for elements that contain data content only and for attribute values.