Specification of a couple of XPath expressions against the demo.xml file.

demo.xpaths.json

{
    "source": "demo.xml",
    "namespaces": {
        "xlink": "http://www.w3.org/1999/xlink",
        "dhbw": "http://dhbw-mannheim.de"
    },
    "xpaths" : [
        {
            "expr": "//comment()"
        },{
            "expr": "//dhbw:vorlesung",
            "subExpr": ".."
        },{
            "expr": "//@*[local-name(.)='href' and namespace-uri(.)='http://www.w3.org/1999/xlink']"
        }
    ]
}