Magic links are a feature of MediaWiki core that create automatic links for three hardcoded external identifiers.As of MediaWiki 1.28,this feature is disabled by default but may be enabled using the$wgEnableMagicLinks configuration parameter.
Examples:
ISBN 0-7475-3269-9 →ISBN 0-7475-3269-9PMID 1234 →PMID 1234RFC 1234 →RFC 1234ISBN is hardcoded to link to Special:Booksources (although the content of that special page can be changed by editingMediaWiki:Booksources andMediaWiki:Booksources-text), while the URLs for PMID and RFC can be changed by editing thesystem messagespubmedurl andrfcurl, respectively.
As of MediaWiki 1.46, for ISBN numbers, there is aparser function for{{#isbn}} that provides the same functionality as the deprecated ISBN magic link.
Because magic links are hardcoded and inflexible, you can also use more straightforward interwiki or links:
[[Special:Booksources/0-7475-3269-9|ISBN 0-7475-3269-9]] →ISBN 0-7475-3269-9[[pmid:1234|PMID 1234]] →PMID 1234[[rfc:1234|RFC 1234]] →RFC 1234Creating local templates similar to Wikipedia'sw:Template:ISBN,w:Template:IETF RFC, andw:Template:PMID or Wikiversity'sv:Template:ISBN,v:Template:RFC, andv:Template:PMID may be useful.