# Image::ExifTool::BuildTagLookup - phpMan

## NAME
    [Image::ExifTool::BuildTagLookup] - Build ExifTool tag lookup tables

## DESCRIPTION
    This module is used to generate the tag lookup tables in
    [Image::ExifTool::TagLookup].pm and tag name documentation in
    [Image::ExifTool::TagNames].pod, as well as HTML tag name documentation.
    It is used before each new ExifTool release to update the lookup tables
    and documentation, but it is not used otherwise. It also performs some
    validation and consistency checks on the tag tables.

## SYNOPSIS
      use [Image::ExifTool::BuildTagLookup];

      $builder = new [Image::ExifTool::BuildTagLookup];

      # update [Image::ExifTool::TagLookup]
      $ok = $builder->WriteTagLookup('lib/Image/ExifTool/TagLookup.pm');

      # update the tag name documentation
      $ok = $builder->WriteTagNames('lib/Image/ExifTool/TagNames.pod','html');

      # print some statistics
      my $count = $$builder{COUNT};
      foreach (sort keys %$count) {
          printf "%5d %s\n", $$count{$_}, $_;
      }

## MEMBER VARIABLES
    PRESERVE_DATE
        Flag to preserve "Last revised" date in HTML files. Set before
        calling WriteTagNames().

    COUNT
        Reference to hash containing counting statistics. Keys are the
        descriptions, and values are the numerical counts. Valid after
        BuildTagLookup object is created, but additional statistics are
        added by WriteTagNames().

    WRITE_PSEUDO
        Returned list of writable pseudo tags.

## AUTHOR
    Copyright 2003-2022, Phil Harvey (philharvey66 at gmail.com)

    This library is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.

## SEE ALSO
    Image::[ExifTool(3pm)], [Image::ExifTool]::[TagLookup(3pm)],
    [Image::ExifTool]::[TagNames(3pm)]