Non-commercial XQuery -- SQL ?

Hi,
I was just curious if there were any open-source libraries, extensions, etc. which would allow one to convert XQuery into SQL (where possible), and/or SQL into XQuery? If one is dealing with tabular data, I would think this shouldn't be so impossible to exist... And it would make migration to BDBXML more practical as well as allow programs to be written in a truly database-abstracted manner so that the code could work on a relational system or XML system (again, assuming it was for a tabular data-centric representation of data). If so, what languages are they available in?
thanks very much for your help,
Brett

It makes a lot of sense to map data back and forth, especially if you are using, as I mentioned, tabular rather than hierarchical data. XML can represent tabular data just fine if you look inside any XHTML table element. Such an extension would not need to be limited to poorly-scalable projects. There are, as the other user pointed out, commercial applications that do this too. I found a number of hits when searching, but not for any open source projects.
The reason to use this is that one's code could be more portable. If I just wanted to administer and utilize a (native) XML database, I could still use existing code which only knew relational SQL queries (and which used a database abstraction layer), but would work on either XML or relational databases.
Likewise, if I preferred XQuery, I could stick to a familiar syntax, and, as long as I was not trying to query contrary to the tabular schema that relational data would fit (though even hierarchical representations are possible if the relational database is structured properly albeit in an inherentyl less aesthetic way), I should have no problem working on either type of database.
One could even imagine an application where XQuery was querying and "joining" XML and relational sources together, and I thought I even remember reading about some program that did this.
I think giving people choices is a nice thing, especially when it is also made easy to switch between those choices if one so decides.
best wishes,
Brett

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