メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.378346562682 43.7795958748385, 142.377585642694 43.7798242947281, 142.376813569957 43.7800874260795, 142.37612128107 43.7788483446281, 142.376929012273 43.7786104607351, 142.377664022667 43.7783946781489, 142.378346562682 43.7795958748385)) ^^http://www.opengis.net/ont/geosparql#wktLiteral