メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.395555836248 44.175530914022, 142.394223243977 44.1753300816119, 142.394503249709 44.1744462018935, 142.395825105492 44.174658101063, 142.395555836248 44.175530914022)) ^^http://www.opengis.net/ont/geosparql#wktLiteral