Wow, I'm really impressed with the potential of the Metadata project!

I was wondering on the direction Pentaho will be taking with the underlying metadata query language (your own bred called MQL I believe).

*Are there plans to extend to support non-SQL metadata and queries - i.e. OLAP/MDX (or OLAP w/ XML/A), XMLDB's Xpath/Xquery, possibly even JCR datasources.

*If there are no plans to go to that extent, why not examine the JPA-QL and possibly extend there any additional features that may be missing.

I see MQL being a very important part of the metadata services, and would like to see a clear roadmap towards future enhancements. When you are working with multiple underlying query languages, that is a very complex subject that is still looking for a 'silver bullet' ;-)