From W3C Wiki

Proposed WebDescription formats, with brief summaries if they have a particular niche or history, in rough chronological order.

Please restrict to generic formats; formats that describe specific patterns of use should be listed on WebDescriptionExamples. Discussion of these formats should be on separate pages; link to them with a (discuss Format'Name) link.

We've got proposals that use XML and RDF/XML for the syntax; are there any microformats for generically describe Web applications out there? -- MarkNottingham

HTML forms or Web Forms 2.0 is probably the closest thing to the spirit of microformatted service description. -- MarkBaker

I'm experimenting with WAIF in embedded RDF which would effectively be an XHTML microformat for service description. -- IanDavis

See also (should be moved to WebDescriptionExamples?) :