Update XML operator documentation to reflect new requirements
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                 Key: DERBY-5095
                 URL: https://issues.apache.org/jira/browse/DERBY-5095
             Project: Derby
          Issue Type: Improvement
          Components: Documentation
    Affects Versions: 10.8.0.0
            Reporter: Knut Anders Hatlen


The developer's guide mentions the classpath requirements for using the XML 
operators: http://db.apache.org/derby/docs/dev/devguide/cdevstandardsxml.html

After DERBY-2739, this section is a bit out of date and the following should be 
updated:

1) "For the XML operators to work properly, Derby requires that a JAXP parser, 
such as Apache Xerces, and Apache Xalan are included in the Java classpath."

Since we're no longer using Xalan directly, we shouldn't state that Apache 
Xalan must be in the classpath. We could for example replace "Apache Xalan" in 
the above sentence with "and a DOM Level 3 XPath implementation, such as Apache 
Xalan,".

2) "After JVM version 1.4, Sun renamed the JAXP packages. Derby cannot find 
these renamed packages."

This is no longer true. Derby can now find the required packages on newer Sun 
JVMs (at least on Java 6 and newer).

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