メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.907256021814 43.5122022414105, 141.907004524435 43.5122372831209, 141.9065488712 43.5123204112057, 141.906066299076 43.5106021904861, 141.906934582032 43.5104655542116, 141.907602170691 43.5103637554161, 141.908099699428 43.5120846873223, 141.907256021814 43.5122022414105)) ^^http://www.opengis.net/ont/geosparql#wktLiteral