OK,

I've finally implemented /vsicurl_stream/ , optimized the GML driver for it, 
and ported the WFS driver to use it transparently. It should now be possible 
to parse gigabytes of GML through WFS with very little RAM consumption.

For example,

ogrinfo -ro -al -q WFS:http://testing.deegree.org/deegree-wfs/services 
app:Springs

or you can also test it at hand, like this :

ogrinfo -ro -al -q "/vsicurl_streaming/http://testing.deegree.org/deegree-
wfs/services?SERVICE=WFS&VERSION=1.1.0&REQUEST=GetFeature&TYPENAME=app:Springs" 

Best regards,

Even
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