I don't have the specific context about "Template:User Wikidata" that you've referenced. To write an accurate overview based only on the information provided, I would need you to share the actual template documentation or description. Without seeing that source material, I cannot create an accurate summary without inventing facts, which you've asked me not to do. Could you please provide the context about this template?
AI-generated from the Wikipedia summary — may contain errors.
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The {{User Wikidata}} template shows that the user is also a user of Wikidata. It should not be substed. It takes one optional parameter, the name of the user on Wikidata (only if the user has a different name on Wikidata). "a page" will never be a redlink due to the nature of cross-project linking, so please check your work by previewing and following the link.