For systems that are large and complex, engineering is often done in multiple tools and by multiple individuals. The separate configurations are required to work together, but resolving the references between these different configurations can be a significant task. A common solution to simplify this task is a naming convention for the items that are being referenced. Providing an automatic lookup capability for these names would greatly simplify configuration. Each system can specify its own names and configurations can be built to just use the names, without having to know the exact address of the items. The exact address would include the address of the Server, the address of the tag in the Server, the required protocol for connecting to the Server, security settings etc. OPC UA defines a GDS that can provide information about what Serversare available in a system and how to connect to them, but it does not currently provide information about the tags that are available in a given Server.