Almost uniquely with XML this is a case where a regex would also work:

perl -n -e 'while(s/<([\w\d\:]+)//){$f{$1}++;}\
    END{print map "$_\n", sort keys %f;\
        print "There are ", scalar(keys %f), " tags in the files\n"} *
+.xml

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Assuming well formed XML of course

In reply to Re: Count number of unique tags in XML files by hawtin
in thread Count number of unique tags in XML files by leriksen

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