メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.236143548899 36.1576885955606, 136.238734525271 36.1577147319212, 136.238662058517 36.1580647926091, 136.238536795601 36.1586373573587, 136.238532405953 36.1586574340861, 136.238486743813 36.1591800233442, 136.237572765326 36.1591687350771, 136.236120054182 36.1591505754916, 136.233786091949 36.1590960915911, 136.23386539454 36.157647890815, 136.236143548899 36.1576885955606)) ^^http://www.opengis.net/ont/geosparql#wktLiteral