This property determines the path identifying an OPC UA Block Tag in the server to which an OPC UA Driver connects. This path's definition is flexible and depends on the specific server. Usually, servers specify an ID space with hierarchical items, such as ParentItem.ChildItem.Tag1. The ItemID property works as a unique key to data, considering where or what allows an OPC UA server to connect to a data source. Although its default value is empty, users must specify a value so that this OPC UA Block Tag be considered valid.