I'm looking for an easy way to look up possible values for Dublin Core Metadata Element Set elements and so on. For example, a metadata element (sorry if my terminology is wrong here) might be:
<dc:language>en-US</dc:language>
. How do I find out if, for example, an accepted alternative value here is en-AU or something else, i.e.:
<dc:language>en-AU</dc:language>
I've looked here: http://wiki.dublincore.org/index.php/User_Guide/Publishing_Metadata#dc:language ( and here http://www.idpf.org/epub/30/spec/epub30-publications.html).
Thanks for any help.