def is_linked(self):
<EOL>return self._kwargs['<STR_LIT>']<EOL>
Tests if this data element is linked to other data in the object.

        Updating linked data elements should refresh all metadata and
        revalidate object elements.

        return: (boolean) - true if this element is linked, false if
                updates have no side effect
        *compliance: mandatory -- This method must be implemented.*