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I have this service: http://sdi.gdos.gov.pl/wfs?SERVICE=WFS&REQUEST=GetCapabilities&VERSION=2.0.0 in version 2.0.0.

When I do a describe feature request for a certain feature type, the key to select the relevant feature type in the KVP should be TYPENAMES. TYPENAME is used for earlier versions.

For example: http://sdi.gdos.gov.pl/wfs?SERVICE=WFS&VERSION=2.0.0&REQUEST=DescribeFeatureType&TYPENAMES=GDOS:SpecjalneObszaryOchrony should work, but it does not. It is not selecting only the feature type GDOS:SpecjalneObszaryOchrony.

But if I used http://sdi.gdos.gov.pl/wfs?SERVICE=WFS&VERSION=2.0.0&REQUEST=DescribeFeatureType&TYPENAME=GDOS:SpecjalneObszaryOchrony with TYPENAME for earlier versions, then it works.

Why TYPENAMES does not work? I added the version in the KVP, so it should be fine!

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EDIT

Despite my answer below was accepted with upvotes it is unfortunately wrong. I checked the WFS 2.0 standard:

Table 15 — DescribeFeatureType KVP encoding
TYPENAME - A comma separated list of feature types to describe. If no value is
specified, the complete application schema offered by the server
shall be described.

So you must use TYPENAMES in GetFeature but TYPENAME in DescribeFeatureType. The Polish server behaves correctly.

My answer was:

Software do have bugs. This certain server does not behave according to WFS 2.0.0 standand with the DescribeCoverage request. It awaits "TYPENAME" as a keyword and when it sees "TYPENAMES" it skips the whole parameter as unknown and unsupported. You get the same response by keywords like &FOO= or &TYPNAM= http://sdi.gdos.gov.pl/wfs?SERVICE=WFS&VERSION=2.0.0&REQUEST=DescribeFeatureType&TYPNAM=GDOS:SpecjalneObszaryOchrony

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