DOAP (Description Of A Project) is a RDF (XML) based format which describes important aspects of a project. By creating a DOAP file for your project, you can provide essential details about your project which can then be presented to various audiences in various formats, along with information about other ASF projects.
The result of the discussion was a consensus to use - "Description Of A Project" which is an RDF based format. The decision was taken for the following reasons:
This site (projects.apache.org) is generated from DOAP files that each project maintains individually. If a project hasn't provided a link to their DOAP file, it won't appear on this site. If the project you're interested in isn't here, send them a link to this page, and tell them to create a DOAP file to get themselves listed!