Current OGC policy is for srsName to be encoded as an HTTP URI: http://www.opengis.net/def/crs/EPSG/0/4326
We currently support parsing HTTP srsNames in the GML 2 form: http://www.opengis.net/gml/srs/epsg.xml#4326 This is done by HTTP_AuthorityFactory. The authority for this form, set in Citations.HTTP_OGC, is "http://www.opengis.net";. The problem is that ManyAuthoritiesFactory assumes that the correct factory for an srsName can be found by matching the start of the srsName against the authority for the factory. This assumption prevents me from adding a second factory for "http://www.opengis.net/def/crs/"; because these URIs will also be matched by HTTP_AuthorityFactory. I can either: (1) Change the authority of Citations.HTTP_OGC from "http://www.opengis.net"; to "http://www.opengis.net/gml/srs/"; so that I can add a new factory with authority "http://www.opengis.net/def/crs/";, or (2) Hack HTTP_AuthorityFactory to support the new form. Option (1) appears to be the cleanest because it preserves the one-factory-per-form pattern. However, it will break any third-party code that depends on the authority identifier, making it a backwards-incompatible change. Option (2) would be quite straightforward, but I am worried about hidden magic axis-order behaviour. For historical reasons (we can still see the scars), the GML 2 form is treated as having longitude/latitude axis order by applications such as GeoServer: http://docs.geoserver.org/latest/en/user/services/wfs/basics.html#axis-ordering I do not know where this conversion occurs. Does anyone know of using HTTP_AuthorityFactory to parse the new HTTP URI form http://www.opengis.net/def/crs/EPSG/0/4326 would cause the resulting CRS it to have longitude/latitude axis order? (It is meant to have latitude/longitude axis order.) There is some code in HTTP_AuthorityFactory.defaultAxisOrderHints, but I do not understand what it does nor how it is used. I will be writing unit tests to gather evidence. For more discussion on why we need HTTP URIs, see: https://jira.codehaus.org/browse/GEOT-4160 Kind regards, -- Ben Caradoc-Davies <ben.caradoc-dav...@csiro.au> Software Engineer CSIRO Earth Science and Resource Engineering Australian Resources Research Centre ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ GeoTools-Devel mailing list GeoTools-Devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-devel
