我使用SPARQL请求:
select distinct ?place ?label ?lat ?lng where {
GEO OBJECT
SUBTYPE "http://franz.com/ns/allegrograph/3.0/geospatial/spherical/km/-180.0/180.0/-90.0/90.0/50.0"
HAVERSINE (POINT(105.8522, 21.0287), 1.0 KM) {
?place vtio:hasGeoPoint ?loc.
?place rdf:type vtio:FastFood.
?place rdfs:label ?label.
?place vtio:hasLatitude ?lat.
?place vtio:hasLongtitude ?lng.
} where {
} FILTER(lang(?label)='vn')
} LIMIT 5
但是当我执行它时,有一个错误:
Executing query failed:
QUERY FAILED: Geospatial subtype
"http://franz.com/ns/allegrograph/3.0/geospatial/spherical/km/-180.0/180.0/-90.0/90.0/50.0"
not found.
我使用的是allelecograph 4.12.1。那么,SUBTYPE
我应该使用什么,谢谢!
答案 0 :(得分:1)
您必须先注册spherial类型。我是通过JENA API做到的:
URI sphericalTypeURI=conn.registerSphericalType(50,"km");
其中conn
是当前连接(AGRepositoryConnection
的实例)