メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.104843540362 43.8199287467122, 144.103854894941 43.8202183326864, 144.103278856334 43.8193359625674, 144.104320399612 43.8190363445761, 144.104583006352 43.8194815971693, 144.104814251092 43.8198736518454, 144.104843540362 43.8199287467122)) ^^http://www.opengis.net/ont/geosparql#wktLiteral