メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.374910227422 43.7767216524188, 142.375310517562 43.7774565245765, 142.374665831687 43.7776439419197, 142.373928205939 43.7778681107205, 142.373507684602 43.7771213691135, 142.373529458045 43.7771151927279, 142.372851738089 43.7758998547675, 142.373572048288 43.775700887115, 142.374243135856 43.7755009314994, 142.374910227422 43.7767216524188)) ^^http://www.opengis.net/ont/geosparql#wktLiteral