About: http://webisa.webdatacommons.org/426363986

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	I have figured out that the problem is a conflict with the virtual robots.txt files generated by WordPress when a user (un)selects 'Discourage search engines from indexing this blog'.
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.org