メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.643442433409 42.8226492144807, 141.644089512911 42.823117684963, 141.643566158659 42.8235628636169, 141.643552051584 42.8235741123354, 141.643015230315 42.8240033210016, 141.642373216615 42.8235589246184, 141.64168957725 42.8230928519503, 141.642234114108 42.8226319705944, 141.642786084196 42.8221820974512, 141.643442433409 42.8226492144807)) ^^http://www.opengis.net/ont/geosparql#wktLiteral