A URI is provided to identify the pattern. The URI can be dereferenced to return informal documentation for the pattern including a list of examples and public schemas which exhibit the pattern.

A normative expression, used to detect a pattern in an document, returning a set of one or more XML element and attribute nodes. The expression having a context node of an <xs:schema> element node which may be an document element, or an <xs:schema> element contained inside an document such as description.

Note, the expressions used to identify individual patterns may be wrapped inside an stylesheet or schema and used to detect patterns contained in a or other document, see and . Readers unfamiliar with may find the list of used within this specification useful.

Optionally one or more non-normative documents or fragments, followed by one or more valid instance document fragments.