handler element handler handler stack stack object contain uri localnam qname attribut attribut sax except handler result descript attribut valu descript handl stereotyp group fig qname equal group descript descript start fig messag port pgml stack parser parser pgml stack parser stack owner ref attribut valu href object owner parser owner owner ref fig messag port fmp fig messag port owner fig group handler contain fig group add fig fmp result fig group handler pgml stack parser stack fmp pgml stack parser set common attr fmp attribut parser regist fig fmp attribut valu result unknown handler stack result 