The Guggenheim www.guggenheim.org uses Joomla, and there are now plugins that allow for Joomla to retrieve assets from Institutional Repositories that are used for preservation. I would use Joomla as the CMS layer, Omeka www.omeka.org as the exhibition builder and have all the assets preserved and stored in an IR like DSpace www.dspace.org that can contain any number of schema for metadata.
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