Short CRS Format

src/main/java/eu/simstadt/regionchooser/RegionChooserUtils.java

@@ -60,7 +60,9 @@ public static CoordinateReferenceSystem crsFromSrsName(String srsName) {
 		// urn:ogc:def:crs,crs:EPSG:6.12:31467,crs:EPSG:6.12:5783
 		//   or
 		// urn:ogc:def:crs,crs:EPSG::28992
-		Pattern pOGC = Pattern.compile("urn:ogc:def:crs(?:,crs)?:EPSG:[\\d\\.]*:([\\d]+)\\D*");
+		//   or short form used by some German (NRW/ALKIS) CityGMLs:
+		// crs:EPSG::25832
+		Pattern pOGC = Pattern.compile("(?:urn:ogc:def:)?crs(?:,crs)?:EPSG:[\\d\\.]*:([\\d]+)\\D*");
 		Matcher mOGC = pOGC.matcher(srsName);
 		if (mOGC.find()) {
 			return CRS_FACTORY.createFromName(EPSG + mOGC.group(1));

src/test/java/eu/simstadt/regionchooser/CRSfromCityGMLHeaderTests.java

@@ -48,6 +48,12 @@ void testExtractCRSFromValladolid() throws IOException {
 		testExtractCSRNameFromHeader(repo.resolve("Others.proj/Valladolid_Spain_only_header.gml"), "EPSG:25830");
 	}
 
+	@Test
+	void testExtractCRSFromShortOgcCrsFormat() {
+		// e.g. NRW/ALKIS CityGMLs use "crs:EPSG::25832" instead of the full "urn:ogc:def:crs:EPSG::25832"
+		assertEquals("EPSG:25832", RegionChooserUtils.crsFromSrsName("crs:EPSG::25832").toString());
+	}
+
 	@Test
 	void testDontExtractCRSFromBrokenCityGML() throws IOException {
 		Path citygmlPath = repo.resolve("Others.proj/SimpleSolid_MSBS.gml");