メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.353265946444 43.1123143297606, 141.3536962643 43.1123799883054, 141.354170605086 43.1124482372925, 141.354061862144 43.1128867759515, 141.353964915517 43.1132734371174, 141.35397088438 43.113291908711, 141.353862808773 43.1136912112204, 141.353633470546 43.1136594678565, 141.353380571562 43.1136240938608, 141.352959550463 43.1135653989268, 141.352444381358 43.1134922546684, 141.352749139058 43.1122422993966, 141.353265946444 43.1123143297606)) ^^http://www.opengis.net/ont/geosparql#wktLiteral