メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.765287717637 43.186785365593, 141.765567482745 43.1876150131648, 141.765580606976 43.1876510063795, 141.765393230609 43.1878467072091, 141.764879138392 43.1883503952656, 141.764852321165 43.1883384664298, 141.76412899461 43.1879720826706, 141.76374880871 43.1877738998314, 141.764239623835 43.1872244760705, 141.765123895106 43.1863475834922, 141.765287717637 43.186785365593)) ^^http://www.opengis.net/ont/geosparql#wktLiteral