The Message Header indicates the sender and recipient of the NewReleaseMessage Message.
The sender and recipient are each defined by a unique DDEX Party ID (DPID). The Message Header also provides a creation date which is a timestamp of when the message was created. DPIDs can be obtained at URL.
Locations of XSDs
Implementers can download a zip archive with all relevant XML Schema definitions from the same page where the relevant standard itself is available for download.
These files are specifically designed to be downloaded and used when implementing the relevant DDEX standards.
Implementers can also access all XML Schema files from the appropriate subfolder from http://ddex.net/xml (e.g. http://ddex.net/xml/ern/351/ for Version 3.5.1 of the Release Notification Message Suite Standard (a.k.a. ERN).
It is these locations that users of the standard are expected to use in the top level tag of a DDEX message exchanged commercially:
Order of XML Attributes
Please see examples below: