メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.38012053751 43.7684285801831, 142.380421352537 43.7689190518778, 142.380447932018 43.7689811858059, 142.378883574941 43.7694183383436, 142.378579389301 43.7688833870229, 142.378289378711 43.7683346730569, 142.379808729412 43.7679058077208, 142.38012053751 43.7684285801831)) ^^http://www.opengis.net/ont/geosparql#wktLiteral