xiftool
application if MWG is specified as a group for any tag on the command line,
or manually with the <code>-use MWG</code> option.  Via the API, the MWG Composite
tags are loaded by calling &quot;<code>Image::ExifTool::MWG::Load()</code>&quot;.</p>

<p>When reading, the value of each MWG tag is <b>Derived From</b> the specified
tags based on the MWG guidelines.  When writing, the appropriate associated
tags are written.  The value of the IPTCDigest tag is updated automatically
when the IPTC is changed i