メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.52102656389 44.0576213534788, 143.519266904571 44.0581505578353, 143.518415603235 44.0568701881187, 143.518305229772 44.0566055329574, 143.519352744511 44.0562672967271, 143.520087387616 44.0560403492296, 143.52102656389 44.0576213534788)) ^^http://www.opengis.net/ont/geosparql#wktLiteral