Consider a transmittal containing terrain geometry, an oceanographic <Property Grid> instance, an atmospheric <Property Grid> instance, and a number of <Model> instances. The terrain is in one SRF, the oceanographic <Property Grid> instance in another, the atmospheric <Property Grid> instance in a third, and some of the <Model> instances in a fourth (in this example, LSR). This situation can be summarized as depicted in Figure 6.65 where appropriate <SRF Summary> instances are components of the respective <DRM Class Summary Item> instances.
Consider a transmittal in which the environment being represented covers two adjacent cells in GTRS Global Coordinate System SRFs. The data provider represents this by creating a <Transmittal Root> instance with two <Environment Root> components, one for each GTRS GCS SRF.