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From "A B (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-688) Enhancements to XML functionality to move toward XPath/XQuery support...
Date Tue, 08 Nov 2005 01:37:21 GMT
Enhancements to XML functionality to move toward XPath/XQuery support...
------------------------------------------------------------------------

         Key: DERBY-688
         URL: http://issues.apache.org/jira/browse/DERBY-688
     Project: Derby
        Type: Improvement
  Components: JDBC, SQL  
    Reporter: A B
 Assigned to: A B 
    Priority: Minor
 Attachments: derbyXMLSpec.html

As of DERBY-334, Derby has some very basic support for XML that consists of an XML datatype
and three operators (XMLPARSE, XMLSERIALIZE, and XMLEXISTS).  I would like to enhance this
existing functionality and, by doing so, help to move Derby incrementally toward a more usable
and more complete XPath/XQuery solution (with emphasis on "incrementally").

I have attached to this issue a document describing the particular changes that I am looking
to make.  At a high level, they consist of:

1) Making it easier to use the XML operators and datatype from within JDBC (ex. by implicit
parsing/serialization of XML values).

2) Adding a new operator, XMLQUERY, to allow a user to retrieve the results of an XPath expression
(instead of just determining whether or not the expression evaluates to an empty sequence,
which is what XMLEXISTS does).

3) Making changes to the existing operators to line them up with the SQL/XML 2005 specification,
and also to take steps toward my eventual hope of having support for XQuery (as opposed to
just XPath) in Derby.

If anyone has time and interest enough to look at the document and provide feedback, that'd
be great...

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