メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.748639555065 43.2053475677668, 141.749131400029 43.2055956572777, 141.747776009151 43.2070117509134, 141.747654435127 43.2069473592896, 141.747292109993 43.2067553212493, 141.747203802928 43.2067085165679, 141.747126120748 43.2066673154106, 141.748427863816 43.2052407269127, 141.748639555065 43.2053475677668)) ^^http://www.opengis.net/ont/geosparql#wktLiteral