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About:
http://webisa.webdatacommons.org/24809729
Property
Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value
You are missing a join from your example2. dad.AnchorDate = NULL will always be incorrect, you may want to set this to something other than NULL to get this to work correctly.
http://www.w3.org/ns/prov#wasQuotedFrom
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