@ramsey it was, about 8 years ago we changed our goal. phpDocumentor will be a documentation framework. That's what we are working on right now. since 1 year we have had full support for RST. Markdown is still experimental, but also ready to be tested by end users.
I will keep building on this until we have the ultimate documentation tool for php. That can generate uml diagrams out of code, and fully integrates api docs with developer docs.
Crell