sfWithin filter question

[Johan Kumps <jo...@telenet.be>]

Hi all,

Let's consider this query (1) and corresponding results:

PREFIX geo: <http://www.opengis.net/ont/geosparql#>

SELECT ?s ?o
WHERE{
   ?s geo:sfWithin ?o .
} ORDER by ?o

Results query 1:
?s ?o
<http://example.org/Feature#A> <http://example.org/Feature#A>
<http://example.org/Geometry#PointA> <http://example.org/Feature#A>
<http://example.org/Geometry#testPoint> <http://example.org/Feature#A>
<http://example.org/Feature#A> <http://example.org/Feature#H>
<http://example.org/Feature#H> <http://example.org/Feature#H>
<http://example.org/Geometry#PointA> <http://example.org/Feature#H>
<http://example.org/Geometry#PolygonH> <http://example.org/Feature#H>
<http://example.org/Geometry#testPoint> <http://example.org/Feature#H>
<http://example.org/Feature#A> <http://example.org/Geometry#PointA>
<http://example.org/Geometry#PointA> <http://example.org/Geometry#PointA>
<http://example.org/Geometry#testPoint> <http://example.org/Geometry#PointA>
<http://example.org/Feature#A> <http://example.org/Geometry#PolygonH>
<http://example.org/Feature#H> <http://example.org/Geometry#PolygonH>
<http://example.org/Geometry#PointA> <http://example.org/Geometry#PolygonH>
<http://example.org/Geometry#PolygonH> <http://example.org/Geometry#PolygonH
>
<http://example.org/Geometry#testPoint> <
http://example.org/Geometry#PolygonH>

What is wrong with this query (2) as it is returning no results:
SELECT ?wkt
WHERE{
   <http://example.org/Geometry#PolygonH> geo:asWKT ?wkt .
   FILTER(geo:sfWithin(?wkt, "<http://www.opengis.net/def/crs/EPSG/0/27700>
POLYGON((30 40, 30 70, 90 70, 90 40, 30 40))"^^<
http://www.opengis.net/ont/geosparql#wktLiteral>)) .
} ORDER by ?wkt

WKT value for  <http://example.org/Geometry#PolygonH> is according to this
query:
SELECT ?wkt
WHERE{
   <http://example.org/Geometry#PolygonH> geo:asWKT ?wkt .
} ORDER by ?wkt

Result:
"<http://www.opengis.net/def/crs/EPSG/0/27700> POLYGON((30 40, 30 70, 90
70, 90 40, 30 40))"^^<http://www.opengis.net/ont/geosparql#wktLiteral>

So I expect  <http://example.org/Geometry#testPoint> as well as <
http://example.org/Geometry#PointA> to be in the result of the query 2.

What am I missing?

Thanks for your help!

Johan,