メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.381330720792 43.7787113607368, 142.380639398649 43.7789126301639, 142.379865082062 43.7791260311387, 142.379201889152 43.7779414364052, 142.379969356173 43.7777204522947, 142.380660913928 43.7775209445628, 142.381330720792 43.7787113607368)) ^^http://www.opengis.net/ont/geosparql#wktLiteral