メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.763066829383 43.1800875903494, 141.763272622008 43.1806882256761, 141.763386625107 43.1810302948639, 141.763542655216 43.1815081353641, 141.763104189372 43.1813023865962, 141.761649203738 43.1805551277744, 141.761142431751 43.1802942222419, 141.761853218138 43.179479978049, 141.762606424023 43.1787247763716, 141.762808831176 43.1793512794394, 141.762908039071 43.1796376566496, 141.763066829383 43.1800875903494)) ^^http://www.opengis.net/ont/geosparql#wktLiteral