I have a Garmin Edge 305 that I use for cycling. It saves data in an xml format (though with the extension tcx). There is a zipped copy of the file in question here. (169k zip, 3.5mb expanded)Now ...

In this case, the data is the XML document and the query may be an XPath or XQuery expression. The results may be XML documents, DOM, SAX or a proprietary ... The first results in exactly one document ...