any

any [ XML Schema Namespace ]

http://www.techquila.com/psi/xmlschema/representation-element/any

Indicates a content model that allows any element to appear. The content may be restricted to a specific namespace (or set of namespaces) by providing a value for the namespace attribute (a white-space separated list of namespace URIs). Special values for the namespace attribute can also be used to indicate that the content may be from any namespace other than the one being defined or that the content should be unqualified XML.