GH-4233: Add GeoSPARQL 1.1 centroid function - #4234
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GitHub issue resolved #4233
Adds the GeoSPARQL 1.1
geof:centroidfunction, also available throughGeometryWrapper.centroid().The function computes a planar centroid using JTS and returns a Point in the input's literal format and SRS. The calculation ignores Z and M and geographic coordinates are treated as planar coordinates without reprojection.
For a non-empty input in a three-dimensional CRS, the result has Z=0. This includes 3D GML results, which remain valid in the source CRS. Tests cover GML serialisation and parsing, WKT, and SPARQL function composition.
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See the Apache Jena "Contributing" guide.