public XPath(String exprString,SourceLocator locator,PrefixResolver prefixResolver,int type) throws javax.xml.transform.TransformerException {
  this(exprString,locator,prefixResolver,type,null);
}

public XPath ( String exprString , SourceLocator locator , PrefixResolver prefixResolver , int type ) throws javax . xml . transform . TransformerException { this ( exprString , locator , prefixResolver , type , null ) ; }
construct an xpath object . ( needs review - sc ) this method initializes an xpathparser / compiler and compiles the expression .
