メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.421346126829 43.7736341976538, 142.421370132635 43.7739543363462, 142.421407058207 43.7743616943711, 142.421434093044 43.7748057057567, 142.421503271216 43.7767780406538, 142.420537914249 43.7763947334541, 142.417588618484 43.7752236213281, 142.417363525572 43.7738163547157, 142.41735458055 43.7737708077212, 142.421346126829 43.7736341976538)) ^^http://www.opengis.net/ont/geosparql#wktLiteral