cataloging metadata standards -- which are important?

Which metadata standards are important to computer collections? CollectiveAccess supports these out of the box: <http://wiki.collectiveaccess.org/index.php?title=Installation_Profiles_in_the_Distribution> - PBCore <http://www.pbcore.org/> - DublinCore <http://www.dublincore.org/> - SPECTRUM <http://www.collectionstrust.org.uk/index.cfm/collection-management/spectrum/> - VRACore <http://www.vraweb.org/projects/vracore4/> - CDWA/CCO <http://www.getty.edu/research/publications/electronic_publications/cdwa/> <http://www.vrafoundation.org/projects.htm> - Darwin Core <http://rs.tdwg.org/dwc/index.htm> - DACS <http://www.archivists.org/governance/standards/dacs.asp> - ISAD(G) <http://en.wikipedia.org/wiki/ISAD(G)> - MARC <http://www.loc.gov/marc/> Are there metadata standards in use by CHM that would be important to support for exchange of catalog metadata? -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>