メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.313138147887 42.2937227041883, 143.313840951521 42.2940052822368, 143.313703939134 42.2941957604963, 143.313371325665 42.2945856999665, 143.312984907096 42.2950381754562, 143.312939360312 42.2951128740207, 143.312733283506 42.294706541264, 143.312590021635 42.2944239831931, 143.311997688269 42.2932560880801, 143.312160263418 42.2933295639467, 143.312476463243 42.2934566223076, 143.312594167178 42.2935039253378, 143.313138147887 42.2937227041883)) ^^http://www.opengis.net/ont/geosparql#wktLiteral