The security principal and which rights to assign to them for the URL reservation. Extensibility point in the WiX XML Schema. Schema extensions can register additional elements at this point in the schema. Unique ID of this URL ACE. If this attribute is not specified, an identifier will be generated automatically. The security principal for this ACE. When the UrlReservation is under a ServiceInstall element, this defaults to "NT SERVICE\ServiceInstallName". This may be either a SID or an account name in a format that [LookupAccountName](https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-lookupaccountnamea) supports. When using a SID, an asterisk must be prepended. For example, "*S-1-5-18". Rights for this ACE. Default is "all". Extensibility point in the WiX XML Schema. Schema extensions can register additional attributes at this point in the schema.