メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.916630291396 43.4993918376542, 141.914983953311 43.4996307349891, 141.914763685026 43.4988933824045, 141.916413699277 43.4986505603121, 141.916543163014 43.4990931870432, 141.916630291396 43.4993918376542)) ^^http://www.opengis.net/ont/geosparql#wktLiteral