メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.034252856543 42.9172426584765, 143.03380092987 42.9172029852268, 143.032119918612 42.9170702110584, 143.032322589442 42.9158378060573, 143.03441462301 42.9159799353821, 143.03440030217 42.9160918615868, 143.034252856543 42.9172426584765)) ^^http://www.opengis.net/ont/geosparql#wktLiteral