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DOM XPath

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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 XPathResult {
  const unsigned short      ANY_TYPE                       = 0;
  const unsigned short      NUMBER_TYPE                    = 1;
  const unsigned short      STRING_TYPE                    = 2;
  const unsigned short      BOOLEAN_TYPE                   = 3;
  const unsigned short      UNORDERED_NODE_ITERATOR_TYPE   = 4;
  const unsigned short      ORDERED_NODE_ITERATOR_TYPE     = 5;
  const unsigned short      UNORDERED_NODE_SNAPSHOT_TYPE   = 6;
  const unsigned short      ORDERED_NODE_SNAPSHOT_TYPE     = 7;
  const unsigned short      ANY_UNORDERED_NODE_TYPE        = 8;
  const unsigned short      FIRST_ORDERED_NODE_TYPE        = 9;

  readonly attribute unsigned short resultType;
  readonly attribute unrestricted double numberValue;
  // Maybe "DOMString?".
  readonly attribute DOMString stringValue;
  readonly attribute boolean booleanValue;
  readonly attribute Node singleNodeValue;
  readonly attribute boolean          invalidIteratorState;
  readonly attribute unsigned long    snapshotLength;
  Node?               iterateNext();
  Node?               snapshotItem(unsigned long index);
};

[Constructor]
interface XPathEvaluator {
  XPathExpression    createExpression(DOMString expression, 
                                      XPathNSResolver? resolver);
  XPathNSResolver    createNSResolver(Node? nodeResolver);
  XPathResult        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?