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Internet domain names, like '''[[Item:Q1|wikibase.cloud]]''', have peculiar properties. They are nominally ''identifiers'' to underlying resources, like ''nytimes.com'' and ''The New York Times''. However, they are not ''persistent'' identifiers, as their value can change. Rather, publications and their owners are more like tenants over the domain name, and can decide to vacate the domain in favor of a new owner.
Internet domain names, like [[Item:Q1|wikibase.cloud]], have peculiar properties. They are nominally ''identifiers'' to underlying resources, like ''nytimes.com'' and ''The New York Times''. However, they are not ''persistent'' identifiers, as their value can change. Rather, publications and their owners are more like tenants over the domain name, and can decide to vacate the domain in favor of a new owner.


This poses a significant challenge to modeling information sources. If a URL is identified as a reference in a Wikipedia article, and that URL is associated with a domain that has changed owners, the URL in question may or may not be a reliable source depending on when it was published.
This poses a significant challenge to modeling information sources. If a URL is identified as a reference in a Wikipedia article, and that URL is associated with a domain that has changed owners, the URL in question may or may not be a reliable source depending on when it was published.