メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.352331571121 44.4792546183444, 142.351442363449 44.4790621248995, 142.352085434916 44.4777498616425, 142.352945090282 44.4779573524513, 142.352800398517 44.4782611652013, 142.352331571121 44.4792546183444)) ^^http://www.opengis.net/ont/geosparql#wktLiteral