English wikipedia, for example, does not allow multiple articles about the same topic however it does allow in many cases does have an article, a list, a Category, a Portal and a wikiproject about the same topic and there is no reason why these should not all link to the same wikidata item, just as a wikipedia article and a wikivoyage article about the same topic both link to the same wikidata item.

Wikidata should allow links to articles in different namespaces. Wikibaseclient can then extract language links to corresponding namespaces. Each of these Client pages can have templates which data extracted from the same item on the wikibaseRepo.

There is a case for allowing sitelinks to multiple items in the same namespace - e.g. articles and lists are in different namespaces on the Spanish and portugese wikipedias but in the same namespace on english and other wikipedias

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