Esempio n. 1
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 /**
  * Function: getElementById
  *
  * Returns the element with the given ID from
  * <document>. The optional attr argument specifies
  * the name of the ID attribute. Default is "id".
  * The XPath expression used to find the element is
  * //*[@attr='arg'] where attr is the name of the
  * ID attribute and arg is the given id.
  *
  * Parameters:
  *
  * id - String that contains the ID.
  * attr - Optional string for the attributename.
  * Default is "id".
  */
 function getElementById($id, $attr = "id")
 {
     $expr = "//*[@{$attr}='{$id}']";
     return mxUtils::selectSingleNode($this->document, $expr);
 }