QNameSet generated by QNameSet.forArray(QName[]) can't be unioned with other 
QNameSets
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                 Key: XMLBEANS-290
                 URL: http://issues.apache.org/jira/browse/XMLBEANS-290
             Project: XMLBeans
          Issue Type: Bug
    Affects Versions: Version 2
            Reporter: David Jencks


I discovered that a QNameSet created from QNameSet.forArray(QName[]) cannot be 
used as an argument to QNameSet.union(qnameSetFromArray).   The set-based 
factory method

QNameSet.forSets(null, Collections.EMPTY_SET, Collections.EMPTY_SET, qnames);

works fine.  I am currently using xmlbeans 2.0 but it looks to me by examining 
the code that the problem is still present in trunk.  I believe that the 
problem is that in
    public static QNameSet forArray(QName[] includedQNames)
    {
        if (includedQNames == null)
            throw new IllegalArgumentException("includedQNames cannot be null");

        return new QNameSet(null, new HashSet(), null, new 
HashSet(Arrays.asList(includedQNames)));
    }


the third set is null rather than empty.

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