Proper syntax for overrides in config file?

Running UCS 5.4.0.5841 on mostly VVX phones.  We use 2600hz.com's provisioning server, which allows for a simple config override by including another URL.  We point this to an https server on our site that contains some overrides.  The overrides are a mix of feature settings, ldap settings, softkey settings, and more.  In other words, we might override anything there as it's our only option to make changes that the 2600hz.com provisioner cannot manage.

In these forums and elsewhere, I see a wide range of likely-valid XML.  Is this acceptable for this use?  Do I really need to break this down further or is this sort of catch-all config valid?

<?xml version="1.0" encoding="UTF-8" standalone="yes"?><PHONE_CONFIG><ALL
                feature.corporateDirectory.enabled="1"
                dir.corp.address="phonedir.example.com"
                dir.corp.autoQuerySubmitTimeout="1"
                [more stuff]
                softkey.feature.doNotDisturb="0"
                feature.doNotDisturb.enable="0"
                divert.dnd.1.enabled="0"
        /> <!-- end ALL --></PHONE_CONFIG> <!-- end PHONE_CONFIG -->

Any pointers to config file format other than the Admin Guide (read it!) are welcome.  I'm eager for more info if this is not the proper way to do a variety of overrides.