question: public Object exec ( List arguments ) throws TemplateModelException { if ( arguments . size ( ) != 1 ) { throw new TemplateModelException ( "Expecting exactly one argument - an XPath expression" ) ; } return deriveModel ( navigator . applyXPath ( nodes , ( String ) arguments . get ( 0 ) , namespaces ) ) ; }
target:  Evaluates an XPath expression on XML nodes in this model.