Question on Support for XML in Oracle 9i and XDK 9.0.1

Hi All,
I just went through the Oracle 9i's features for XML. I have been working with Oracle's XDK too. I noticed that there are some new packages in Oracle 9i like SYS_XMLGEN and DBMS_XMLGEN that produce a XML file when presented a query to it. This feature is there in the XDK (XML SQL Utility) too. So, my question is as follows:
1. Are there any differences in the XML File produced by XDK and these database packages?
2. What are the scenerios when I should go for these packages and when should I go for the XSQL Utility.
Cos I found out that both are doing effectively the same things. Is there any difference between them? Please explain the second question.
Thanks in advance,
Rajat

The sys_xmlagg and sys_xmlgen are native implementations of functionality tied into the database code line. They replicate some of the functionality that was previously provided in a 'plugin' form by the XDK. DBMS_XMLGEN is a PLSQL Package that also provides access to native implimentations of some of this functionalitu. You should find that as a result of being native implimentation they are much more performant.
SYS_XMLGEN and SYS_XMLAGG allow XML to be generated directly from a SQL Query. DBMS_XMLGEN is designed for use in procedural processing and provides a finer grain of control over the generated output.
There are still some features, such as DTD and Schema generation that are not (yet) available with the native implementation, and for this reason, and backwards compatability the XDK functionality is still available
As a rules of thumb, if you can use the native implimentations do so, as performance should be much better.
Mark D. Drake
Senior Product Manager,
XML Infrastructure,
Server Technology

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