Annex C (normative) UADP Header Layouts 
C.3 Message headers for Events and Data with dynamic layout

C.3.3 Header layout URI

The header layout URI for the dynamic layout as specified in C.3.4, C.3.5, C.3.6 and C.3.7 is
http://opcfoundation.org/UA/PubSub-Layouts/UADP-Dynamic