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</o:shapelayout></xml><![endif]--></head><body lang=KO link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hi, I’m a GME beginner to make some DSME.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I’m just trying to designing a metamodel which has its own purposes, however, I got some problems when I assigned some model-constraints into my model.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Let’s think about a metamodel which includes “ A<<Model>> “ , “ B <<Model>> “ , “ AtoB <<Connection>> “. (simply for helping the understanding)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Every Model can be associated by “ AtoB <<Connection>> “. ( like A<<Model>> can associated with B<<Model>>, B<<Model>> also can be associated with A<<Model>> )<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Moreover, only A<<Model>> has enumerate attribute called “ state:enum “. state<<EnumAttribute>> has “ One “, “ Two ” values.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I want to describe a model-constraint as further below.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>“ If AtoB <<Connection>> connected Some Model ( it can be A<<Model>> or B<<Model>>) and If the connected Model has state<<EnumAttribute>> values which has “One” value<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>then informing error message to the designer. “<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Actually I was used a OCL expression to make similar model constraint like <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>“ If AtoB <<Connection>> connected Model which is A<<Model>> then informing error message to the designer “<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>The OCL constraint is “self.connectionPoints("dst")->theOnly().target().name()<>"A"” like this.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>However, the mentioned one is not easy to describe…<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>How can I make a constraint rule in OCL which I mentioned ?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Any advice can be helpful to my research. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thank you.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US><o:p> </o:p></span></b></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>