Hi,

I was investigating a WFS cascading issue when I stepped on this two 
pieces of code (this code is the same in the old WFS store and the new one):
https://github.com/geotools/geotools/blob/master/modules/unsupported/wfs-ng/src/main/java/org/geotools/data/wfs/internal/parsers/XmlSimpleFeatureParser.java#L180-L180
https://github.com/geotools/geotools/blob/master/modules/unsupported/wfs-ng/src/main/java/org/geotools/data/wfs/internal/parsers/XmlSimpleFeatureParser.java#L881-L895

So if GT is not capable to extract a feature id (FID) from a feature, 
the current feature and all next features are ignored. I checked WFS 
specification and related schemas, GML schemas and searched on GS\GT 
mailing list and I'm not sure I understood correctly all the behavior 
around features FIDs.

My impression is that a feature should always be uniquely identifiable 
by an ID but at the same time nothing in GML seems to enforce that. 
GeoTools on is side seems to also assume that a feature can be always 
uniquely identified by an id (I may be wrong).

Can someone shine a light on this ?

Regarding the WFS cascading behavior, does it make sense to allow the 
user to select an attribute that can be used as FID ?

Regards,

Nuno Oliveira

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