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## Principles of Structure

The following figure shows the basic structure of a SISCAD-P command:

Figure 77: SISCAD-P Command Language

The different parts of a command must always be entered in the shown order.

- Action
  Actions are the part of a CAD-command that must be entered first.
  The action (CREATE, ROTATE, .. ) tells SISCAD-P what it is to do with an element.

- Object
  Objects are always entered after actions.
  The object part (POINT, LINE, .. ) determines, what element something is going to be done to.

- Characterization
  Characterizations are entered after objects.
  The characterization defines in which way the action is to be performed to the object.

- Parameter
  Parameters define exactly what elements are involved in the action, resp. what additional conditions must be taken into account.
  SISCAD-P distinguishes between

  - mandatory parameters,
  - choice parameters,
  - optional parameters.