Mendling, JanStrembeck, MarkNeumann, GustafDadam, PeterReichert, Manfred2019-10-112019-10-1120043-88579-380-6https://dl.gi.de/handle/20.500.12116/28691A means to define multiple activity instantiation is an important feature of a business process modelling language. In this paper we suggest to extend BPEL4WS with structured activities for multiple instantiation. In particular, we propose to extend BPEL4WS with a collect and a broadcast activity to model multiple instance behavior as well as array data structures to handle messages of multiple parties that act according to the same role.enText/Conference Paper1617-5468