handler handler handler stack stack object contain uri localnam qname attribut attribut sax except pgml stack parser parser pgml stack parser stack token st token attribut valu descript st element st token str str str str st element str st token str st token str st token str st token str str equal integ pars str integ pars str integ pars str integ pars str set bound pgml stack parser set common attr attribut owner ref attribut valu href owner ref object owner parser owner owner ref owner set owner owner parser regist fig attribut valu contain contain add object fig life line handler parser 