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file:///C:/uml/BOUML/bouml_3.0/doc/TOUT.html72 of 378 07/10/2007 15:55aggregation by value: to define a bi-directional composition, the code generators will produce two attributes whose names are the roles's name. Thiskind of relation may considered to be a shortcut to define two (directional) aggregations by value.By default, the example above produce the following codes (the visibility may be replaced by var to be compatible with Php 4) :C++ Java Php Idlclass C : public C3 {protected:C * dir_a;C * dir_b;C2 * theC2;};class C extends C3 {protected C dir_a;protected C dir_b;protected C2 theC2;}class C extends C3 {protected $dir_a;protected $dir_b;protected $theC2;}valuetype C : C3 {private C dir_a;private C dir_b;private C2 theC2;};class C2 {protected:C * theC;C2 a;friend class C3;};class C2 {protected C theC;protected C2 a;}class C2 {protected $theC;protected $a;}valuetype C2 {private C theC;private C2 a;};The multiplicity and stereotype may be used to produce the appropriate code with a natural and intuitive way. For instance the C's relationtheC2 with the stereotype vector and multiplicity * will produce (depending on the generation settings) :C++ Java Idlvector theC2; protected Vector theC2; private sequence theC2;With the stereotype vector and the multiplicity 12, the C's relation theC2 will produce (depending on the generation settings) :C++ Java IdlC2 * theC2[12]; protected C2[] theC2; private sequence theC2;Refer to the C++ Generator, Java generator, Php Generator and Idl generator for additional information.MenusThe relation menu appearing with a right mouse click on its representation in the browser is something like these, supposing it is notread-only nor deleted (see also menu in a diagram) :