Some issues include:
- what domain to use? Candidates include:
- what about versioning? how to keep in sync with the wiki and test materials?
One proposal is: use www.w3.org, following W3C namespace policy. As to versioning, change the profile whenever the wiki changes (within some reasonable latency, say, a couple weeks or a month). For example: an hCard Profile at w3.org, and discussion: an hCard profile that seems to work with GRDDL.
See also: Microformat FAQs relating to RDF for discussion of connecting microformats to URIs.
And see also: hCard Profile.