# phpman > perldoc > Font::TTF::OTTags

## NAME
    [Font::TTF::OTTags](https://www.chedong.com/phpMan.php/perldoc/Font%3A%3ATTF%3A%3AOTTags/markdown) - Utilities for TrueType/OpenType tags

## SYNOPSIS
      use [Font::TTF::OTTags](https://www.chedong.com/phpMan.php/perldoc/Font%3A%3ATTF%3A%3AOTTags/markdown) qw( %tttags %ttnames %iso639 readtagsfile );

      # Look at built-in stuff:
      $script_tag = $tttags{'SCRIPT'}{'Cypriot Syllabary'};  # returns 'cprt'
      $lang_name = $ttnames{'LANGUAGE'}{'ALT '};             # returns 'Altai'

      # Map iso639-2 tag to/from OT lang tag
      @isotags = $iso639{'ALT '};    # returns [ 'atv', 'alt' ]
      $lang_tag = $iso639{'atv'};    # returns 'ALT '

      # Read latest tags file to add to built-in definitions
      readtagsfile ("C:\\Program Files\\Microsoft VOLT\\TAGS.txt");

    First-level keys to %tttags and %ttnames are:

    SCRIPT
        retrieve script tag or name

    LANGUAGE
        retrieve language tag or name

    FEATURE
        retrieve feature tag or name

    Built-in data has been derived from the 2014-07-11 draft of the 3rd edition of ISO/IEC 14496-22
    (Information technology - Coding of audio-visual objects - Part 22: Open Font Format) which,
    when finalized and approved, will replace the second edition (ISO/IEC 14496-22:2009).

## METHODS
  readtagsfile ( filename )
    Read a file in the syntax of Tags.txt (included with Microsoft VOLT) to obtain
    additional/replacement tag definitions.

    Returns 0 if cannot open the file; else 1.

## AUTHOR
    Bob Hallissy. <<http://scripts.sil.org/FontUtils>>.

## LICENSING
    Copyright (c) 1998-2016, SIL International (<http://www.sil.org>)

    This module is released under the terms of the Artistic License 2.0. For details, see the full
    text of the license in the file LICENSE.