------------
REQUIRE TAGS
------------

  ----------
  TAG FORMAT
  ----------

    Where "Mod" represents the PTM/Perl module you wish to require (include):

    <?REQUIRE Mod REQUIRE?>
    <?require Mod require?>
    <?require Mod ?>
    <?~ Mod ~?>
    <?~ Mod ?>
    <?~
      Mod
    ?>

  -----------
  DESCRIPTION
  -----------

    The REQUIRE tag is very different in usage from all of the other PTM tag
    types. REQUIRE is used as a port of Perl's "require" statement, which is
    used to import Perl modules at run-time. In Perl, the "use" statement is
    used to include modules at compile-time while "require" is used to include
    them at run-time. Because everything in PTM is evaluated at run-time, there
    is no need for Perl's "use" statement at any time. However, developers
    often need to include other Perl files into their Perl scripts, be it a
    predefined Perl library or just a custom function file. The REQUIRE tag was
    created because PREPROCESS tags run independent of the rest of your PTM
    scripts. As a developer, you dont want to have to include a module into your
    script twice, as it adds to processing overhead and eliminates variables
    that were modified in the included code the first time. The REQUIRE tag is
    processed at a higher lexical scope than the rest of the PTM tags, and is
    the very FIRST thing processed every time a PTM script is run, even before
    the PREPROCESS tags. This ensures that your required files are included in
    both the PREPROCESS and standard PTM tags. The contents of each REQUIRE tag
    are parsed using Perl's qw() functionality, which seperates its contents
    into an array based on white space (spaces, tabs, new lines, etc.). Because
    of this, module names do not need to be quoted, but cannot contain white
    space in their file names. Like Perl's "require" statement, If no file
    extension is given, an extension of ".pm" is assumed. If you wish to require
    a file of a different type, the extension must be added. Extensionless files
    are not accepted. Multiple files may be required at the same time with the
    REQUIRE tag by placing white space between their names. Files may be
    REQUIRED from any of the directories included in Perl's @INC path list, or
    from the same directory in which the PPA (PTM Parser Application) [ptm.cgi]
    file is stored.

  --------------
  USAGE EXAMPLES
  --------------

    -------------------------------------------------------------------------
    Example 1: Adding Database Functionality with the PTMDB [PTMDB.pm] Module
    -------------------------------------------------------------------------

      <?~ PTMDB ?>

    ------------------------------------------------------------------
    Example 2: Including a File with a File Extension Other than ".pm"
    ------------------------------------------------------------------

      <?~ MyModule.pl ?>

    ------------------------------------------------------
    Example 3: Including Multiple Modules at the Same Time
    ------------------------------------------------------

      <?~ PTMDB MyPMModule MyPLModule.pl ?>