are evaluated left-to-right and top-to-bottom; the first one that equals the
switch expression
triggers execution of the statements of the associated case;
the other cases are skipped.
If no case matches and there is a "default" case,
its statements are executed.
There can be at most one default case and it may appear anywhere in the
"switch" statement.

  <mime-type type="application/gzip">
    <_comment>Gzip Compressed Archive</_comment>
    <alias type="application/x-gzip"/>
    <alias type="application/x-gunzip"/>
    <alias type="application/gzipped"/>
    <alias type="application/gzip-compressed"/>
    <alias type="application/x-gzip-compressed"/>
    <alias type="gzip/document"/>
    <magic priority="45">