About: http://webisa.webdatacommons.org/91254155

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	An example of a column constraint is NOT NULL, and an example of a table constraint is a compound foreign key, which, because it is compound, cannot be declared with column constraints.
http://www.w3.org/ns/prov#wasQuotedFrom	techtarget.com