PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Relational databases, such as IBM DB2, Oracle, Microsoft SQL Server, and MySQL, can not handle mixed data types and unstructured data, because they do not fit into the columns and rows of a predefined data model (see Hadoop's Flexibility Wins Over Online Data Provider).
http://www.w3.org/ns/prov#wasQuotedFrom
  • informationweek.com