メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.911081806354 43.8291039032849, 143.911956793258 43.8300065162879, 143.912383993734 43.8304471078428, 143.913830040951 43.8319384764703, 143.908175316008 43.8348015429168, 143.904169006551 43.8306715844895, 143.906999116256 43.8292455961927, 143.908573364251 43.8284427085163, 143.909822882336 43.8278053905604, 143.911081806354 43.8291039032849)) ^^http://www.opengis.net/ont/geosparql#wktLiteral