[2012/7/4]
��ISO����վ���Կ�����UML2.4.1��OCL2.3.1������Ϊ2012����±���
UML2.4.1 Infrastructure http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=32624
UML2.4.1 Superstructure http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=52854
OCL 2.3.1 http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=57306
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