Changes
add support for lowercase parameter names per talk
-->{{#switch:{{NAMESPACE}}||{{ns:14}}=<!-- Only articles and categories.
-->{{#invoke:Check for unknown parameters|check|unknown=[[Category:Pages using authority control with parameters]]|preview=Page using [[Template:Authority control]] with "_VALUE_", please move this to Wikidata if possible}}<!--
-->{{#ifeq:{{{viaf|{{{VIAF|}}}}}}|
|<!-- empty or no VIAF in template -->
|<!-- VIAF in template
|<!-- no property P214 at Wikidata --> [[Category:VIAF not on Wikidata]] <!-- These we still need to import -->
|<!-- property P214 at Wikidata -->
{{#ifeq:{{{viaf|{{{VIAF|}}}}}}|{{#property:P214}}
|<!-- same ID: We want to end up here -->
|[[Category:VIAF different on Wikidata]] <!-- Figure out the best link, FIXME: multiple values on Wikidata -->