Le jeudi 26 juillet 2012 21:41:57, Chris Crook a écrit : > Hi Even > > Thanks for the suggestion and code examples - very helpful. I haven't > followed up on this yet partly because this has prompted me to look at > other storage formats for the data (something I'd been putting off). > > If I understand the GML driver documentation properly then I would have to > manage the possibility of the user having a field called FID, as after > I've saved the data, then reloaded with GMS_EXPOSE_FID set to NO, that > field will be lost?
If a user creates a 'fid' field, then that one will be used to set the fid attribute of the element. It will not be "lost" strictly speaking, but indeed if GML_EXPOSE_FID is set to NO, then it will not be visible. > As you suggest, renaming the fields before saving and > then after reloading would fix handle this. Not sure to understand you here : are you speaking about the mechanism for saving the old value of GML_EXPOSE_FID, setting GML_EXPOSE_FID=OLD, calling OGROpen() and restoring the original value of GML_EXPOSE_FID ? If so, this will not change anything about the behaviour with a user field called 'fid'. The intention here was not to interfere with other parts of QGIS that might manipulate GML files. For example, if a user opens a GML file through "Add Vector Layer", he might want to see the fid reported. _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer