メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.41447176251 43.7450350779692, 142.414547277034 43.7455960635792, 142.412866922989 43.7457050503852, 142.412672633168 43.7457167498277, 142.411244255829 43.7457796838236, 142.410519546106 43.745807344072, 142.410270421645 43.7447913513044, 142.410464471942 43.7447820110346, 142.411280279212 43.7447378046231, 142.412548843751 43.7446656199072, 142.414439168632 43.7445585580697, 142.41447176251 43.7450350779692)) ^^http://www.opengis.net/ont/geosparql#wktLiteral