This schema is not normative, or even definitive. The prose copy in the XLink 1.1 recommendation (http://www.w3.org/TR/xlink11/) is definitive, although it should not differ from this file, except for the absence of these two initial comments. In keeping with the W3C's standard versioning policy, this schema document will persist at http://www.w3.org/XML/2008/06/xlink.xsd. At the date of issue it can also be found at http://www.w3.org/1999/xlink.xsd. The schema document at that URI may however change in the future, in order to remain compatible with the latest version of XML Schema itself, or with the XLink namespace itself. In other words, if the XML Schema or XLink namespaces change, the version of this document at http://www.w3.org/1999/xlink.xsd will change accordingly; the version at http://www.w3.org/2008/06/xlink.xsd will not change. This schema document provides attribute declarations and attribute group, complex type and simple type definitions which can be used in the construction of user schemas to define the structure of particular linking constructs, e.g. ... ... ... ]]> Intended for use as the type of user-declared elements to make them simple links. Intended for use as the type of user-declared elements to make them extended links. Note that the elements referenced in the content model are all abstract. The intention is that by simply declaring elements with these as their substitutionGroup, all the right things will happen. xml:lang is not required, but provides much of the motivation for title elements in addition to attributes, and so is provided here for convenience. label is not required, but locators have no particular XLink function if they are not labeled. from and to have default behavior when values are missing