メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.051926711292 42.8999182258122, 143.051379346413 42.8998906152505, 143.051386248767 42.8998400683113, 143.051438882351 42.8994503347839, 143.051451672405 42.8993301155097, 143.051530892044 42.8985857158008, 143.051610560537 42.8980383164983, 143.052051809301 42.8989648256061, 143.051926711292 42.8999182258122)) ^^http://www.opengis.net/ont/geosparql#wktLiteral