I was trying to validate an XML against its XSD schema using "xmllint", but I got the following errormessage:
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mets_audio.xml:9: element audioMD: Schemas validity error : Element '{http://www.loc.gov/AMD/}audioMD': No matching global declaration available for the validation root.
mets_audio.xml fails to validate
XML tag definitions are case sensitive within an XSD schema, so "audioMD" had to be "AUDIOMD" in order to comply with the official XSD schema of my example.