Red link

A "wikilink to an article that does not exist shows up red" and is commonly referred to as a red linkCiteRef::mws:redlink.

Property values shown as red link

 * Properties and respective values with a datatype "Page" will be shown as a red link in accordance with above definition.
 * Running the "rebuildData.php" maintenance scriptCiteRef::mail:user:smw:td5075433CiteRef::mail:user:smw:tp5075433p5075467 can temporarily render typed properties and values red linked.
 * Changing the content language where a localized "Has type" special property serving as an identifierCiteRef::mail:user:smw:tp5075433p5075458 is used will nullify the the type definition.
 * A non-semantic extension, i.e. an extension to Semantic MediaWiki occupies the "Property" namespaceCiteRef::gh:smw:2358.