titleType definition. Used to describe the meaning of a link or resource in a human-readable fashion, along the same lines as a ROLE or ARCROLE attribute (see roleType and arcroleType definitions). A value is optional; if a value is supplied, it SHOULD contain a string that describes the resource or link. The value MAY be used to make titles available to applications used by visually impaired users, or to create a table of links, or to present help text that appears when a user lets a mouse pointer hover over a starting resource.
string
<simpleType name="simpleTitleType" >
<restriction base="string" />
</simpleType>