メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.399421858434 44.1847107972982, 142.398370962699 44.1845487500573, 142.397913871909 44.1844677037693, 142.397720781009 44.1844334633154, 142.397915397602 44.1838311827885, 142.399694316949 44.1841058093973, 142.399421858434 44.1847107972982)) ^^http://www.opengis.net/ont/geosparql#wktLiteral