def where_patterns(provider_uri)
      [[TYPE, RDF::EDM.provider, provider_uri],
       [TYPE, RDF.type, RDF::ORE.Aggregation]]
    end
def where_patterns(provider_uri)
      [[TYPE, RDF::EDM.provider, provider_uri],
       [TYPE, RDF.type, RDF::ORE.Aggregation]]
    end
@param provider_uri [#to_uri] a URI for an edm:provider value.

 @return [Array<Array<#to_term>>] An array of pattern arrays that match
   ore:Aggregations with the given provider_uri
 @see RDF::Query
 @see RDF::Query::Pattern