XQuery on XML DB

Question

I'm using the XQuery Java API (OJXQI) and I managed to combine the content of local XML file and relational table from database in the following way:
FOR $a IN document ("bib.xml")/bib/book
FOR $b IN sqlquery("select * from scott.emp")/ROW
WHERE $b/SAL < $a/@year
RETURN
<EMP empID="{$b/EMPNO}"> {$b/ENAME} {$a/@year}</EMP>
Now I would like to reach the content of Oracle XML DB also. How to do it? I tried using the 'sqlquery' function like this:
FOR $a IN sqlquery("SELECT extractValue
(object_value,'/PurchaseOrder/Reference')
FROM purchaseorder")/ROW
RETURN $a
and WebDAV access
FOR $a IN document("http://localhost:8080/home/SCOTT/purchaseOrders/2002/Jun/JONES-20021009123336602PDT.xml")
RETURN {$a//Requestor}
but it doesn't do the trick.

Answer 1

You may want to check out new preview technology from Oracle called XML Data synthesis (XDS) (http://otn.oracle.com/tech/xml/xds/index.html).
XDS is based on XQuery. In XDS you can define a external XQuery function declaratively. XDS supports various types of data sources like any type of database, Web service, Semi-structured Non-XML data like an Excel Spreadsheet which can be translated to XML, any XML document,Any EIS source using J2EE Connector Architecture and an XQuery itself as a source to another XQuery.