メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.388864815418 44.1691662799622, 142.388282466919 44.1690778381027, 142.387610094246 44.1690873279014, 142.387333216381 44.1682278230045, 142.388261220505 44.1683640046039, 142.388283348984 44.1682917627714, 142.389106400042 44.168427977215, 142.389072939307 44.1685302588424, 142.388864815418 44.1691662799622)) ^^http://www.opengis.net/ont/geosparql#wktLiteral