メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.420289595668 43.8019666877404, 142.421340253279 43.8026261072175, 142.420130182861 43.8036168741277, 142.419113797032 43.8029746607175, 142.418102435778 43.8023244821267, 142.419284155578 43.801346464291, 142.420080774822 43.8018468008183, 142.420289595668 43.8019666877404)) ^^http://www.opengis.net/ont/geosparql#wktLiteral