... free A1 A2 D4 A3 mandatory Skip mandatory R2 mandatory restricted mandatory D1 D2 D3 Fig Abstract example introducing the schema level of the case handling meta model mandatory for A1 , A2 and A3 ... charge of a case based on that case definition may enter a value for D1 when A1 is ready for execution In addition, she may also enter a value for D2 at this instant, which implicitly performs A2 ... definitions As indicated above, D1 is mandatory for A1 , A2 and A3 , D2 is mandatory for A2 , while D3 is restricted for A3 D0 and D4 are free data elements, which appear in form definition F3, associated...