About: http://webisa.webdatacommons.org/170212150

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	There you can specify the extensions of the types of files you would like it to index, e.g. doc for Microsoft Word files, pdf for PDF documents, and so on.
http://www.w3.org/ns/prov#wasQuotedFrom	tucows.com