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Both have advantages and disadvantages depending on how complex the source is. Wholesale replacement is attractive because all you have to do is retract what was once asserted; build new RDF which is then asserted. If you keep (i.e. don’t retract) the new people and organization RDF then chances are they will be available inin Per0.xml or Org0.xml when needed. On the other hand, wholesale replacement can be very time consuming. To replace the many tens of thousands of Academic Articles in VIVO at Cornell would take several hours just to retract. However, for small sources wholesale replacement is a good choice.
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