Metadata are structures that describe data. They must be created and assigned to an edge. At first, each edge has still a form of a dashed line. Only after metadata have been created and assigned to the edge, the line becomes continuous.

You can create metadata as shown in corresponding sections below, however, you can also double-click the empty (dashed) edge and select Create metadata from the menu. Or you can link some existing external metadata file by selecting Link shared metadata.

Figure 18.2. Creating Metadata on the Empty Edge

You can also assign metadata to an edge by right-clicking the edge, choosing the Select metadata item from the context menu and selecting the desired metadata from the list.