メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.05467974137 42.9199809568207, 143.055456577965 42.9200314853697, 143.05528872483 42.9212584837779, 143.054566043379 42.9212009631436, 143.054549088523 42.9211996759553, 143.053783158924 42.9211500493699, 143.053902988242 42.9199367530079, 143.05467974137 42.9199809568207)) ^^http://www.opengis.net/ont/geosparql#wktLiteral