メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.403759813379 44.1725558078856, 142.402884267927 44.1724304791477, 142.402217573476 44.1723219875657, 142.402419724607 44.1716773565916, 142.402474321415 44.1715246444361, 142.403613628582 44.1717200997862, 142.403652594737 44.1719446030344, 142.403702125297 44.172219808147, 142.403759813379 44.1725558078856)) ^^http://www.opengis.net/ont/geosparql#wktLiteral