Engines / servers that operate on XML plus SQL tables, RDF triples

[ken_north@compuserve.com]

With respect to the state of the art in XML database engines, there are 
several that go beyond XML storage and XQuery processing.

Among the native XML database engines, eXist is notable for an XQuery 
extension for SQL processing. But several platforms are distinct for 
operating with multiple types of data (SQL tables, XML documents, RDF 
triples, user-defined types) and multiple query languages (SQL, XQuery, 
SPARQL). Included in this group are IBM DB2, Oracle 11g and OpenLink 
Virtuoso.

Last month Microsoft jumped in with a patent filing for RDF processing:

RDF STORE DATABASE DESIGN FOR FASTER TRIPLET ACCESS
"In consideration of the above-described deficiencies of the state of 
the art, the invention provides RDF store database designs and 
efficient techniques for converting SPARQL queries to SQL queries, 
related systems, and methods that are practical, can provide faster 
triplet access, and which can reduce the computational overhead and 
cost associated with storing large volumes of RDF metadata."

Are there other servers or engines, perhaps in academia, that support 
SQL, XPath, XQuery and SPARQL queries of tables, documents and RDF 
triplets?

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