Help:Magic links
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 1234
ISBN is hardcoded to link to Special:Booksources (although the content of that special page can be changed by editing MediaWiki:Booksources and MediaWiki:Booksources-text), while the URLs for PMID and RFC can be changed by editing the system messages pubmedurl and rfcurl, respectively.
Alternatives
As of MediaWiki 1.46, for ISBN numbers, there is a parser 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 1234
Creating local templates similar to Wikipedia's w:Template:ISBN, w:Template:IETF RFC, and w:Template:PMID or Wikiversity's v:Template:ISBN, v:Template:RFC, and v:Template:PMID may be useful.
- {{ISBN|0-7475-3269-9}} → ISBN 0-7475-3269-9