The support of file directory structures is declared by aggregating an instance of the FileDirectoryType with the BrowseName FileSystem as illustrated in Figure 1.

Figure 1 – FileSystem example

The Object representing the root of a file directory structure shall have the BrowseName FileSystem. An OPC UA Server may have different FileSystem Objects in the AddressSpace. HasComponent is used to reference a FileSystem from aggregating Objects like the Objects Folder or the Object representing a device.