OpenACS

URNs provide an abstraction and a single place for e.g updating

references to external resources when switching between a CDN and a

local resource, or when a resource should be updated. Instead of

adding e.g. a CDN url via tempate::head::add_script, one can add an

URN and control its content from a single place.

Example:

  template::register_urn \

      -urn urn:ad:js:jquery \

      -resource /resources/xowiki/jquery/jquery.min.js

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