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If someone ever decides to write down DOM XPath (i.e. a proper version of the DOM3XPath note), take this into account:

WebIDL interfaces

interface XPathEvaluator {
  XPathExpression    createExpression(DOMString expression, 
                                      XPathNSResolver resolver);
  XPathNSResolver    createNSResolver(Node nodeResolver);
  object             evaluate(DOMString expression, 
                              Node contextNode, 
                              XPathNSResolver resolver, 
                              unsigned short type, 
                              object result);
Document implements XPathEvaluator;

Indeed, you can both construct this object and access its methods on Document. Isn't the world wonderful?