public function load(array $args)
    {
        $envelope = new MetadataEnvelope();
        $constantValues = MetadataEnvelope::getConstantValues();

        foreach ($constantValues as $constant) {
            if (!empty($args['Metadata'][$constant])) {
                $envelope[$constant] = $args['Metadata'][$constant];
            }
        }

        return $envelope;
    }