Since the general description in OPC 10000-3 about the semantic difference between Properties and DataVariables are not applicable for the information provided about the Server the rules described in OPC 10000-3 are used.
If simple data structures should be provided, Properties are used. Examples of Properties are the NamespaceArray of the Server Object and the MinSupportedSampleRate of the ServerCapabilities Object.
If complex data structures are used, DataVariables are used. Examples of DataVariables are the ServerStatus of the Server Object and the ServerDiagnosticsSummary of the ServerDiagnostics Object.