question: serializes a feed to an xml string with a stylesheet declaration and an optional gnupg signature . concode_field_sep PlaceHolder placeHolder concode_field_sep void addStylesheet concode_elem_sep String appendSignature concode_elem_sep String toXmlText concode_elem_sep String readAll
target: String function ( OpenPgp arg0 , InterfaceDocument arg1 , String arg2 ) { addStylesheet ( arg1 ) ; String loc0 = toXmlText ( arg1 ) ; return ( arg2 == null ) ? loc0 : appendSignature ( arg0 , loc0 , arg2 ) ; }