[OGDev] CSS classes for categories and locales

This came up on discussion over on openguides-oxford. We'd like to be able to put a distinctive style on pages for places that have now closed. Rather than hardcoding this for a "Closed" or "Now Closed" category, Dom and I thought a better solution would be to simply add classes for all categories and locales that a page is in.

So for example, http://oxford.openguides.org/wiki/?The_Jam_Factory

would have HTML:

<div id="content" class="cat:baby_changing_facilities cat:free_wifi cat:pubs cat:restaurants cat:wifi loc:park_end_street loc:west_central">

rather than the simple <div id="content"> that's currently there.

Thoughts? Objections?

Kake