PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • category is a built in taxonomy, not a custom taxonomy. do you have multiple taxonomies, or are you just using the built in category taxonomy? your second block of code sets post type to book, if you have got another post type you have not added it to the query.
http://www.w3.org/ns/prov#wasQuotedFrom
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