how to advertise in opensearchdescription if a download is available in multiple formats

[pvgenuchten]

While researching #165, i ran into the following challenge:

In some feeds in the netherlands data-publishers have decided to put the same dataset in multiple formats online, to facilitate ease-of-reuse. An example is here: http://services.rce.geovoorziening.nl/www/download/data/Rijksmonumenten_nl.xml
In that scenario would I have to add to URL element twice in the opensearch description, for each of the available formats? Having a unique url per format? That would cause problems if some of the datasets are exposed in less or more formats then other datasets in the same service.

<Url type="application/zip" rel="results" template="https://www.nationaalgeoregister.nl/geonetwork/opensearch/dut/download?format=application/zip&spatial_dataset_identifier_code={inspire_dls:spatial_dataset_identifier_code?}&spatial_dataset_identifier_namespace={inspire_dls:spatial_dataset_identifier_namespace?}&crs={inspire_dls:crs?}&language={language?}&q={searchTerms?}"/>
<Url type="application/gml+xml" rel="results" template="https://www.nationaalgeoregister.nl/geonetwork/opensearch/dut/download?format=application/gml+xml&spatial_dataset_identifier_code={inspire_dls:spatial_dataset_identifier_code?}&spatial_dataset_identifier_namespace={inspire_dls:spatial_dataset_identifier_namespace?}&crs={inspire_dls:crs?}&language={language?}&q={searchTerms?}"/>

testreport:
http://inspire-sandbox.jrc.ec.europa.eu/etf-webapp/v2/TestRuns/EID6af4d855-4d6c-4532-9506-b86e207ac25c.html

[jonherrmann]

Based on this template:
<Url type="application/zip" rel="results" template="https://www.nationaalgeoregister.nl:/geonetwork/opensearch/dut/download?spatial_dataset_identifier_code={inspire_dls:spatial_dataset_identifier_code?}&amp;spatial_dataset_identifier_namespace={inspire_dls:spatial_dataset_identifier_namespace?}&amp;crs={inspire_dls:crs?}&amp;language={language?}&amp;q={searchTerms?}"/>

The INSPIRE validators sends this request:
https://www.nationaalgeoregister.nl/geonetwork/opensearch/dut/download?spatial_dataset_identifier_namespace=http://www.cultureelerfgoed.nl&spatial_dataset_identifier_code=dd7d8650-7651-11e0-a1f0-0800200c9a61&crs=http://www.opengis.net/def/crs/EPSG/0/28992&language=nl

with Accept header application/zip. The validator expects that the service response Content-Type equals the media-type from the GetSpatialDataset URL. But the service returns a XML document.