メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.554673083293 42.9824422389606, 141.553366932065 42.9820794772044, 141.552787215085 42.9818916806617, 141.552413098595 42.9816800248441, 141.551764863545 42.9812917816572, 141.551706871587 42.9812571061714, 141.551395268851 42.9810704436887, 141.552672124817 42.9804275146518, 141.554346796844 42.9811808240542, 141.555719883697 42.9818340996975, 141.55602453848 42.9821375292531, 141.556113609626 42.9823307076637, 141.556142019704 42.9828502105272, 141.554673083293 42.9824422389606)) ^^http://www.opengis.net/ont/geosparql#wktLiteral