Hi all,
thanks for the feedback.

You are correct Jukka it seems that I created a duplicated issue :( thanks for 
the warning.

So 'text/xml; subtype=gml/3.2' is an invalid MIME type that doesn't comply with 
WFS 2.0 specification but is interpreted as XML by clients that ignore the 
subtype parameter which is handy (note that the parsing of this MIME type will 
fail for clients that actually try to interpret the full MIME type definition).

On the other side, 'application/gml+xml; version=3.2' is a valid MIME type 
compliant with WFS 2.0 specification but is an horrible monstrosity that is not 
recognized as XML by common clients like browsers.

Note that WFS 2.0 reference implementation uses 'application/gml+xml; 
version=3.2' as MIME type for GML 3.2 documents and adverts:

   <OutputFormats>
   <Format>application/gml+xml; version=3.2</Format>
   <Format>application/xml; subtype="gml/3.2.1"</Format>
   </OutputFormats>

So I see two options here:

1. Being compliant with WFS 2.0 specification by default which means give 
preference to 'application/gml+xml; version=3.2', this will require a flag in 
WFS configuration to allow the restore of the previous behavior so clients that 
cannot be modified will still work.
2. Not being compliant with WFS 2.0 specification by default and use 
'application/gml+xml; version=3.2' only when CITE compliant flag is enabled.

I vote for option 1.

Cheers,

Nuno Oliveira

On 05/13/2017 09:55 AM, Andrea Aime wrote:
Il 13 mag 2017 1:07 AM, "Ben Caradoc-Davies" <b...@transient.nz 
<mailto:b...@transient.nz>> ha scritto:

    Nuno,

    standards conformance is a good thing. There are three issues that we
    need to discuss:

    (1) This is a backwards-incompatible change for clients that rely on
    receiving a response with a "text/xml" MIME type. As this behaviour does
    not comply with the WFS 2.0 standard, clients have no basis to expect
    it, but it is nonetheless a change that may have some impact.


Good call, we need a flag to re-instate previous behavior to avoid breaking 
upgrades
for those that cannot fix the clients.


    (2) GML 3.1 output will still use "text/xml". This is inconsistent with
    GML 3.2 output, but then the WFS 1.1 and 2.0 standards are inconsistent.
    Do we prefer standards conformance or consistency?


We have been running Cite tests for many years and are trying to update them 
(first my repeated failed attempts at prepping the work and then getting the 
community on board,
and now Nuno working on Wfs 2.0 conformance, and Jody also said Boundless has 
an interest in upgrading the others to current) so
I guess the choice has been "conformance" (at least most of the time, I don't 
pretend to make it the one and only).


    (3) Web browsers (certainly Firefox and Chrome) commonly display
    "text/xml" inline but offer to download "application/gml+xml". Try the
    layer previews and demo requests with your change applied and see the
    difference between GML 3.2 and GML 3.1. I can read XML (it is a Markup
    Language after all) and I like "text/xml" which indicates something a
    human can read. I think "application/gml+xml" is a horrible monstrosity.


LOL, I agree it's pretty bad, but so are other things that we are doing to
be compliant :-)

Cheers
Andrea


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