メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.383681513455 43.7622975705866, 142.383906204714 43.7622285177971, 142.383955690982 43.7628515476372, 142.382477348629 43.7632774529069, 142.382195410028 43.7627355077073, 142.381865901087 43.7621555538717, 142.383360467417 43.7617330119274, 142.383681513455 43.7622975705866)) ^^http://www.opengis.net/ont/geosparql#wktLiteral