Since we're removing magic link functionality, we should still have a convenient way to link to ISBNs, so wikis don't have to copy the same basic template over and over again.
A virtual namespace or parser function has been proposed:
- [[ISBN:0-7475-3269-9]]
or
- {{#isbn:0-7475-3269-9}}
Leaning to the virtual namespace since it is more expected for a link.