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Re: [dxwg] Clarification on foaf:homepage / dcat:landingPage for dcat:Catalog (#763)

From: Alejandra Gonzalez-Beltran via GitHub <sysbot+gh@w3.org>
Date: Mon, 18 Feb 2019 23:43:23 +0000
To: public-dxwg-wg@w3.org
Message-ID: <issue_comment.created-464923119-1550533401-sysbot+gh@w3.org>
Adding clarification on usage of properties is always good, so I agree in the context of this issue.

About the semantic overlap between them, I think we could clarify when is relevant to use the properties in different ways for ```dcat:Catalog```, especially when describing a catalogue of catalogues. In this case, ```foaf:homepage``` will point to the main page of the catalogue and ```dcat:landingPage``` will be the page of that catalogue within the catalogue of catalogues (when considering the catalogue as a dataset). 

e.g. for the [list of catalogues in EDP](https://www.europeandataportal.eu/data/en/organization), the ```dcat:landingPage``` for the Open Data Portal Estonia is https://www.europeandataportal.eu/data/en/organization/avaandmete-portaal, while the ```foaf:homepage``` is https://opendata.riik.ee

When considering a single catalogue of datasets, both properties may indeed overlap, but it is also possible that they differ. 

e.g. for the Belgium Open Data portal, ```foaf:homepage``` would be https://data.gov.be/en, while the ```dcat:landingPage``` could be ```https://data.gov.be/en/search/datasets```

Now checking the definitions...

In DCAT2014, [```dcat:landingPage```](https://www.w3.org/TR/vocab-dcat/#Property:dataset_landingpage) was defined as: ```A Web page that can be navigated to in a Web browser to gain access to the dataset, its distributions and/or additional information.``` with domain ```dcat:Dataset``` and range ```foaf:Document```.

We have now relaxed the domain (see https://github.com/w3c/dxwg/issues/122) and changed the text of [the definition](https://w3c.github.io/dxwg/dcat/#Property:resource_landing_page) to: 
```A Web page that can be navigated to in a Web browser to gain access to the catalog, a dataset, its distributions and/or additional information.```

For ```foaf:homepage``` for ```dcat:Catalog``` we have:
- [DCAT2014](https://www.w3.org/TR/vocab-dcat/#Property:catalog_homepage): ```The homepage of the catalog.```
- [DCATrev](https://w3c.github.io/dxwg/dcat/#Property:catalog_homepage): ```A homepage of the catalog (a public web document usually available in HTML).```
and we have notes clarifying that is an inverse functional property. 

So, the subtle distinction is between identifying the primary page of the resource and a page that allows to gain access to the resource. 

So, what about adding these clarifications and examples?

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Received on Monday, 18 February 2019 23:43:24 UTC

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