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Secondly, ISO13606 is an extract, which means its information instances are constructed by processing existing data (which might be relational, objects, XML, etc) and generating the output. Thus the normalisation (i.e. 'factoring') and structure of data items in the 13606 Extract makes sense (hopefully) for sharing data in a context-free manner (i.e. the receiver of the extract can use it as-is, without needing to refer to the source system), but may not be good design for the source system, and in fact may be quite different from the latter. We can thus think of some 13606 attributes as being 'rafactoredrefactored' attributes - they model data that is likely to be located elsewhere in the source system.
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