PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • This section describes the differences, and describes how these data types are handled.The important thing to remember is that, in PowerPivot, a blank value, an empty cell, or a missing value are all represented by the same new value type, a BLANK. How blanks are handled in operations, such as addition or concatenation, depends on the individual function.
http://www.w3.org/ns/prov#wasQuotedFrom
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