メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.253274733384 43.1405456387862, 141.252748197704 43.1409208353974, 141.250921869957 43.1395836795416, 141.251118587875 43.1392571700601, 141.251298672893 43.1393211902789, 141.25172289727 43.1394848107394, 141.252001366698 43.139605386257, 141.252153728089 43.1397030626972, 141.252499616542 43.1399477898817, 141.252622360077 43.1400360645885, 141.252808353143 43.1401976795136, 141.253274733384 43.1405456387862)) ^^http://www.opengis.net/ont/geosparql#wktLiteral