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The XPATH Navigator View is a helpful tool to evaluate/test xpath expressions against XML documents or parts of it.
The XPATH Navigator View uses Xalan's XPath engine for executing queries. See the packed Xalan jar files for the concrete Xalan version.
XPath Navigator View
XPath Navigator View showing result as text
XPATH queries cann only be executed against loaded documents. The consequence is that you have to open the XML document to run a XPATH query against it.
The XPATH Navigator executes queries against the editor source document. This means that the query is not directly executed against the XML file on your disk but against the DOM representation of the document directly provided by the editor.