I think that building blocks are really a good idea for Semantic Modelling. In my opinion, it is posible to have a good 3NF as Core and have one or more Semantic Models laying on top of it, because there could be many different ways of seeing the same information. And Semantic Models har more to do with "navigating" the information.
I also think that most business see the same kind of basic information, for example what I mean is that most of retailers want to see "daily sales", "monthly revenue", "stocks turns", etc. And using Teradata's iLDM as the 3NF Core Model could improve the implementation of these Metrics with the utilization of Building Blocks. Maybe a little of customization would be needed but the basics can be delivered in a more standarized and effective way.
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