Boss just asked me how long to transform an XML file to another format, given that each XML tag will equate to a unique value in the output format. So I gave him my rate to code a lookup table of {XML tag names => unique values} and said to divide that into the number of unique tags. Of course he wanted me to count the XML tags, and I came up with this. Requires XML::Parser and related dependencies.
#!/usr/bin/perl -w

use strict;

use XML::Parser;

my %tags;

my $p = XML::Parser->new(Handlers => {
                      Start => sub {$tags{$_[1]}++;
},
                     },
            )
    or die "cannot create parser :: $!";

foreach my $file (@ARGV) {
  eval {
      $p->parsefile($file);
  };
  die $@ if $@;
}

print "The keys are\n";
print map "$_\n", sort keys %tags;
print "There are ", scalar(keys %tags), " tags in the files\n";

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In reply to Count number of unique tags in XML files by leriksen

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