Modeling a Data Reading Action

Reading persistent or temporary data with an action can be modeled using an object flow from the data object to the data reading action.

Context

To express that an action reads data, create an object flow in the direction of the reading action.

Persistent data are read from a data store. Temporary data are read from a buffer node.

How to proceed

Select the data store or buffer node in the diagram.

The selected node is outlined with a blue frame and the carousel appears.
Select the object flow edge icon from the carousel and keep the left mouse button pressed.
With the left mouse button pressed, drag the icon in the direction of the reading action.
Release the mouse button over the action that the object flow edge should flow into.

The object flow edge is created. As with almost all model elements, it has a logical name; however, this is not relevant for the modeling and is not visible in the diagram. You can immediately change the properties of the control flow edge using the Properties tool window or the edge's context menu. An input pin of the same type as the linked data store or buffer node automatically appears for the reading action.