About: http://webisa.webdatacommons.org/207463282

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	Someone say you can directly change the file extension ???.pps??? to ???.ppt???, but it doesn???t always work, especially on PowerPoint 2007 and later, when PowerPoint formats have been upgraded to PPTX, PPSX, etc.
http://www.w3.org/ns/prov#wasQuotedFrom	dvd-ppt-slideshow.com