9 Profiles and Namespaces 
9.2 OPC UA Conformance Units and Profiles
9.2.2 Client Facets
The following table specify the facets available for Clients that implement the TMC Information Model companion standard.
Table 79 – TMC Client Facet Definition
| Conformance Unit | Description | Optional/ Mandatory |
|---|---|---|
| TMC Essential | Essential client features. See chapter 6.15.2 for more information. | M |
| TMC Advanced | Advanced client features. See chapter 6.15.2 for more information. | O |
| Profile | ||
| Standard UA Client Profile | M | |
| Base Client Behaviour Facet | M | |
| Request State Change Client Facet | M | |
| File Access Client Facet | M | |
| Documentation Client Facet | O | |
| Durable Subscription Client Facet | O | |
| Data Access Client Facet | M | |
| Notifier and Source Hierarchy Client Facet | M | |
| Method Client Facet | M | |
| Base Event Processing Client Facet | M | |
| Historical Access Client Facet | M | |
| HIstorical Data AtTime Client Facet | M | |
| Historical Structured Data Access Client Facet | O | |
| Base Historical Events Client Facet | M | |
| Security Policy [B] - –asic256SHA256 | M | |
| Security User Access Control Full | M | |
| Security Time Synch - –TP/OS based support | M | |
| Best Practice - –ime Outs | M |