Atom validation: TG Requirement 28 too strict?

[damienmulder]

Running the validation on the following Atom https://service.pdok.nl/provincies/aardkundige-waarden/atom/index.xml results in an error:
Missing at least one link to a registry (a /atom:feed/atom:link element with attributes rel='describedby' and type='text/html').

According to TG Requirement 28

• There has to be a link element referring to either the INSPIRE registry or a local schema
• Such links should have rel='describedby' and type='text/html'

In our case we have multiple links.

<link href="https://service.pdok.nl/provincies/aardkundige-waarden/atom/ps-aw.xml" rel="self" hreflang="nl"></link>
<link href="https://service.pdok.nl/provincies/aardkundige-waarden/atom/index.xml" rel="up" type="application/atom+xml" hreflang="nl" title="Top Atom Download Service Feed"></link>
<link href="https://www.nationaalgeoregister.nl/geonetwork/srv/dut/csw?service=CSW&amp;version=2.0.2&amp;request=GetRecordById&amp;outputschema=http://www.isotc211.org/2005/gmd&amp;elementsetname=full&amp;id=f002bfc5-7d87-46b6-819e-8415422b65c9" rel="describedby" type="application/xml" hreflang="nl"></link>
<link href="https://www.nationaalgeoregister.nl/geonetwork/srv/dut/catalog.search#/metadata/f002bfc5-7d87-46b6-819e-8415422b65c9" rel="describedby" type="text/html" hreflang="nl" title="NGR pagina voor deze dataset"></link>

Note that we do have a link element with rel='describedby' and type='text/html' (.4th element)
Also, we have additional link elements with rel='describedby' but another type (type="application/xml", 3rd element).

The 3rd element seems to cause a validation error in the following code:
a.notExists("//atom:feed/atom:link[(@rel='describedby') and @type!='text/html']/@href","TR.missingLinkToRegistry");

However, TG Requirement 28 does not seem to require that all link elements with rel='describedby' should also have type='text/html'?

[fabiovinci]

Dear @damienmulder,
thank you for identifying the corner case and bringing it to our attention.

TG Requirement 28 mandates providing a link (rel='describedby') to the definition of each Spatial Object Type included in the dataset.
If the dataset is harmonised, the link should point to INSPIRE Registry (rel='describedby' and type='text/html').

Since we cannot verify if the dataset is harmonised, the validator should only check if at least a link of type rel='describedby' is present. If the related href element points to the INSPIRE Registry, then the validator should check that the type attribute is equal to 'text/html'.
We will update the relevant ATS to clarify this behavior and modify the test in the validator.

For your ATOM service, it should be valid even if it contains two links (rel='describedby') that point to the relevant dataset metadata and not the definitions of the Spatial Object Types included in the dataset.

[damienmulder]

Dear @fabiovinci,

Thanks for looking into this issue, we're looking forward to the modified test.

Kind regards

[fabiovinci]

Dear @damienmulder,
the fix is now available in staging and is functioning properly.
It will be included in the upcoming release.
Please test it and share your feedback.