メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.39782863879 44.1862175451827, 142.397624975544 44.1860649045774, 142.397750073931 44.1859752658913, 142.398608475226 44.1853602071486, 142.398911858596 44.1854097185971, 142.39818340802 44.1859589205623, 142.397960650071 44.1861213053965, 142.39782863879 44.1862175451827)) ^^http://www.opengis.net/ont/geosparql#wktLiteral