Determining whether a macro screen matches the application screen

The macro runtime determines whether a macro screen matches the current application screen by comparing individual descriptors in the macro screen to the current host terminal screen.

In the example scenario, the macro runtime finds the name Screen2 on the list of valid next screens, retrieves Screen2, looks at its descriptors, and compares the descriptors with the host terminal.

Each macro screen contains a <description> element that itself contains one or more descriptors. A descriptor is a statement of fact about the host terminal (application screen in its current state) that can be either true or false. In the example scenario, Screen2 contains three descriptors:

The input inhibited indicator is cleared (input is not inhibited).
There are 80 fields in the host terminal.
There are 3 input fields in the host terminal.

When there are several descriptors in a <description> element, as here, the method that the macro runtime uses to evaluate the descriptors (as boolean true or false) and to combine their results into a single result (true or false) depends on some additional configuration information that is not described here. See Evaluation of descriptors for the configuration information.

In the example scenario, Screen2 is configured in the default manner, so that the macro runtime evaluates each of the three descriptors in turn. If all three are true, then the macro runtime concludes that the overall result is true, and that Screen2 matches the current application screen.

For more information see Evaluation of descriptors.