anchor.diff:  	xmlComment 
   	| 
   	xmlPI
  +	|
  +	cdataSection
   	;
   
   computedConstructor throws XPathException
  
positive.code: 	GTEQ { $setType(GTEQ); }
  	|
  	XML_PI_END { $setType(XML_PI_END); }
  	;
  
  protected CHAR
  
negative.code: protected XML_COMMENT_END : "-->" ;
  protected XML_PI_START : "<?" ;
  protected XML_PI_END : "?>" ;
  protected XML_CDATA_START : "<![CDATA[";
  protected XML_CDATA_END : "]]>";
  
  protected LETTER
  :
  