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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" >
Expanded Declaration

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