メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.701814028059 44.372922537805, 141.704780681656 44.3710155859768, 141.705853094143 44.3718577766439, 141.702111985525 44.3743368714495, 141.701620344858 44.3739436262306, 141.702444479371 44.3734045553338, 141.701814028059 44.372922537805)) ^^http://www.opengis.net/ont/geosparql#wktLiteral