Hi, The core components work basically via derivation by restriction, I've noticed a little grousing about that here and there, will future usages of core components allow derivation via other methodologies? It seems to me that this has affected the derivation methodologies of UBL reference: http://www.oasis-open.org/archives/ubl-cmsc/200401/msg00001.html, where it looks to me that what one has to do if one wants to add elements is first off derive by restriction, quoting from the referenced url "first derive by restriction, eliminating the element referring to ubl:PartyType from the myns:MyOrderType, then derive by extension adding an element that refers to myns:MyPartyType. "
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