For Namespace (non-reversible) it is dedescribed:
"A NamespaceIndex of 1 is always encoded as a JSON number."

I assume the idea is that a server always reserves the namespace index 1 for its own (local) namespace, using its own namespace URI.
Is this really true, e.g. for "stand-alone" publishers not working as a server, i.e. without an own address space?

If the namespace index matches to e.g. "http://opcfoundation.org/UA/DI/" since the meta data contain only data types of namespace 0 and "DI" namespace, wouldnt it be better to encode also namespace 1 with its URI?
Or shall the meta data always contain an URI for the application (at position 1) - whether it is a server or not?

I would expect some clarification, both in

• part 6 (JSON encoding of ExpandedNodeId )
• part 5 (DataTypeSchemaHeader)
• part 14 (DataSetMetaDataType)

Especially should be defined

• what namespace URIS shall be in the array
• the index in the array has to be incremetned by 1 to get the "real" namespace index (separate issue 8949)