The diagram is the resource that you directly edit with the Component Designer. It is stored as a file with an extension of .dgm.

Each diagram represents a single component and its subcomponents. For example, a ProDataSet diagram can include any number of temp tables and buffers, but only one ProDataSet. The diagram may also include hierarchical relationships between a component and its subcomponents, and two-way (peer-to-peer) relationships between elements.

The diagram file stores only information about the picture displayed on the Component Designer canvas, such as size, position, and color of the elements. It does not contain any schema definitions or application logic; that information is stored in the component model.