XML Schema Complete Reference, The

9.6. The attributeGroup Element

A named attribute-use group specifies a set of attribute uses. An attribute use is either a local attribute type, or a reference to a global attribute type. The XML schema specifies a named attribute-use group once; the XML schema references the named attribute-use group potentially many times. The named attribute-use group provides a convenient mechanism for defining complex types that require the same or similar attribute types. Additionally, named attribute-use groups provide modularity: Simply modifying a named attribute-use group indirectly modifies the complex types that reference that named attribute-use group.

The XML representation of a named attribute-use group is the attributeGroup element. Listing ...