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%might-link-atts; XLink Linking Attributes for Optional Linking

Used for elements which may link to an external source or to an object within the document, but which do not necessarily act as a link at all. The attribute @xlink:href identifies the object to which the link points.
Declaration
<!ENTITY % might-link-atts
            "xmlns:xlink CDATA                            #IMPLIED
             xlink:type  (simple)                         #IMPLIED
             xlink:href  CDATA                            #IMPLIED
             xlink:role  CDATA                            #IMPLIED
             xlink:title CDATA                            #IMPLIED
             xlink:show  (embed | new | none | other | replace)
                                                          #IMPLIED
             xlink:actuate
                         (none | onLoad | onRequest | other)
                                                          #IMPLIED
             hreflang    NMTOKEN                          #IMPLIED"  >