protected function includeModuleMetaData($metadataPath)
    {
        include $metadataPath;
        /**
         * metadata.php should include a variable called $aModule, if this variable is not set,
         * an empty array is assigned to self::aModule
         */
        if (!isset($aModule)) {
            $aModule = [];
        }
        $this->setModuleData($aModule);

        /**
         * metadata.php should include a variable called $sMetadataVersion
         */
        if (isset($sMetadataVersion)) {
            $this->setMetaDataVersion($sMetadataVersion);
        }
    }