About: http://webisa.webdatacommons.org/438118875

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	@Alex: you might want to edit your question to clarify that you are asking why DOMDocument is outputting this entity... most people think you are asking why this entity is not allowed in XML.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com