The Install Manager supports several variables. Supported variables are: ${INSTALLER_NAME}, ${WORKING_DIR}, ${INSTALL_LOCATION}, ${FEATURE_NAME}. The SelectionGroup attribute is mainly for classifying the packages for selection by the user as a group. MaintenancePackage type of "true" and "preDefined" are equivalent values. MaintenancePackage type of "userSelect" means the maintenance to be applied are selected by the user from a list. Non-negative integer followed by an 'M' or a 'K'. Leading and trailing blanks are ignored. The DownloadURL attribute holds the index into the array/List of URLs specified by the FileDownloadURLs element. The DownloadDir attribute specifies the directory relative to the URL where the installer file and lib can be downloaded from the FTP server. The FromPrereq attribute specifies if the installer file and lib are from the prerequisite package specified by the PrereqPackage attribute. The DownloadURL attribute holds the index into the array/List of URLs specified by the FileDownloadURLs element. The DownloadDir attribute specifies the directory relative to the URL where the installer file and lib can be downloaded from the FTP server. The PakEntryName element(s) list the names of pak files bundled within the Zip File if the PakFilename attribute specifies a zip filename. The order of the PakEntry elements is the order the pak file will be installed. Up to 4 groups of decimal digits separated by '.' Leading and trailing blanks are ignored. The TargetPlatforms attribute value may be omitted to mean any platform types. The Timeout attribute value is in seconds. A zero value indicates an indefinite timeout for the command. The AlternateLog if present is a failure log. The AlternateMsg if present is a message that indicates a partial success.