Magle created JXPATH-189:
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             Summary: UnionContext cannot be a paramter of XPath extension 
function
                 Key: JXPATH-189
                 URL: https://issues.apache.org/jira/browse/JXPATH-189
             Project: Commons JXPath
          Issue Type: Bug
    Affects Versions: 1.3
            Reporter: Magle
            Priority: Minor


When getNodeSet() of a UnionContext object is invoked, it's possible that the 
"nodeSet" doesn't be prepared from "contexts", a empty nodeSet will be returned.
for example, an extension function test:count(nodeSet) to get the total count 
of the nodeSet. it doesn't work for UnionContext, test:count('abc'|'ed'), the 
result will be 0.



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