メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.366419791148 43.7660151961932, 142.366712032228 43.7665378606215, 142.36607457646 43.7667163847372, 142.3651904009 43.7669760564936, 142.364905060691 43.7664670589317, 142.364603851806 43.7659151809943, 142.366118596382 43.7654764894497, 142.366419791148 43.7660151961932)) ^^http://www.opengis.net/ont/geosparql#wktLiteral