Sorry, my previous example was wrong. This should work in your example
(assuming the thumbnail exists):
<xsl:value-of select="//mets:fileGrp[@USE='THUMBNAIL']/mets:file/@MIMETYPE"/>

Unrelated to your question, do you have a particular reason to use
"//"? I understand it's less efficient than the original code.
E.g. you basically used this:
//mets:fileGrp[@USE='THUMBNAIL']
instead of this:
$context/mets:fileSec/mets:fileGrp[@USE='THUMBNAIL']


Regards,
~~helix84

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