return port given coordin pair normal deep hit port return owner fig fig group present given coordin pair return fig ad later return messag port inherit doc overrid object deep hit port rectangl rect rectangl width messag node node life line fig intersect rect link posit size messag node node link posit posit life line fig coordin link posit size posit life line fig coordin posit posit posit posit node node node link posit node link posit link posit size messag node node node messag node link posit add node posit life line fig coordin posit posit node node head fig intersect rect node classifi role node set match fig node node 