Identifies the type of Extensible Linking Language (XLink) element the current element is functioning as. The value of this attribute is constrained to certain value(s) by the schema. XLink elements can serve several functions. The function is indicated by the value of the attribute xlink:type. The value of xlink:type can be simple, extended, locator, arc, or resource. In addition to xlink:type, the XLink specification defines several other attributes which are used in various combinations to fulfill the various functions. These attributes are: xlink:href, xlink:arcrole, xlink:role, xlink:show, xlink:actuate, xlink:title, xlink:label, xlink:from, and xlink:to.