メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.705230714304 44.3613400825384, 141.704109419964 44.3620684876869, 141.703949863508 44.3619463609216, 141.703631532665 44.3616920157729, 141.703144362622 44.3613185558171, 141.703030023038 44.3612300792832, 141.704162119752 44.3605042309765, 141.704167641003 44.3605007058868, 141.704276384379 44.36059028146, 141.705230714304 44.3613400825384)) ^^http://www.opengis.net/ont/geosparql#wktLiteral