メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.351891070694 44.4764006164594, 142.350966382111 44.4761709900795, 142.351018797528 44.4760643835316, 142.351579323444 44.4749342949127, 142.352477607892 44.4751524795288, 142.351943137394 44.4762909515645, 142.351891070694 44.4764006164594)) ^^http://www.opengis.net/ont/geosparql#wktLiteral