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What does the "domain" means in the codes

kylin's picture

Hello, I've been reading the codes of Open CASCADE for a while. The word "domain" appears here and there a lot. What does it mean? For example, the function: "void TopOpeBRepBuild_Builder::GFindSamDom(TopTools_ListOfShape& L1,TopTools_ListOfShape& L2)" is meant to complete the lists L1,L2 with the shapes of the DS having same domain. Can someone be kind to tell me what does the domain means?