TAG has strong preference for a single approach to Linking in XML - better interoperability.
XLink, as is, remains unacceptable to HTML-WG - but it is currently the W3C recommendation for XML Linking.
Some apparent willingness to revise XLink to better address the needs of the HTML-WG:
Enhance XLink: infer xlink:type" from Tim Bray.
"XLink+HLink is one story not two" from Steven Pemberton
Also... some mention of XML Schema based approach.
Other discussions: W3C Team, XML-CG, HTML-WG, Public....
The issue remains open.