The DI Information Model is identified by the following URI:

http://opcfoundation.org/UA/DI/

Documentation for the NamespaceUri can be found here.

The NodeSet associated with this version of specification can be found here:

https://reference.opcfoundation.org/nodesets/?u=http://opcfoundation.org/UA/DI/&v=1.05.0&i=1

The NodeSet associated with the latest version of the specification can be found here:

https://reference.opcfoundation.org/nodesets/?u=http://opcfoundation.org/UA/DI/&i=1

The supplementary files associated with this version of specification can be found here:

https://reference.opcfoundation.org/nodesets/?u=http://opcfoundation.org/UA/DI/&v=1.05.0&i=2

The supplementary files associated with the latest version of the specification can be found here:

https://reference.opcfoundation.org/nodesets/?u=http://opcfoundation.org/UA/DI/&i=2

The NamespaceUri for the package_metadata.json with structures and enumerations used for Software Package files is:

http://opcfoundation.org/UA/DI/PackageMetadata/

Note: This namespace and the contained types typically do not show up in the AddressSpace of an OPC UA Server.