It's not implementable generically since there is no way to know the canonical url for an article. Typical URL schemes used by publishers include all sorts of cruft in the URL, therefore it is not possible to reliably identify what article a link points to.
A framework for this could be implemented, which delegates the mapping of links to article urls to the individual recipe sub-class, that is on my TODO list, along with a gazillion other things. Patches are welcome.
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