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Business name is not the same as personname. This creates semantic problems because it looks like a multiple subclass but it isn't. Suggest merging the 2
Both semantics are needed as VCard e.g. uses also two different sets. The question whether we want to revise the Base Data Schema (BDS) should be a question for Version 2. Actually, your suggestion would break compatibility with VCard and would also break the Specification as it stands. The Specification has one place, where business-data is used (e.g. Entity ) and others places where the personname - scheme is used. I think the issue could be clarified further.