JMRI: LogixNG Documentation
Author: Daniel Bergqvist
Keywords: logixng model railroad JMRI LogixNG PanelPro

# LogixNG - The Categories enum

## The Categories enum

Every type of expression and action has a predefined category to which the expression or action belongs to. The main usage of categories is to sort expressions by category when the user adds a new expression or action and therefore selects which to add.

- ITEM
  An item on the layout, for example turnout, sensor or signal mast.
- COMMON
  Commonly used items. For example the expressions And, Or and Timer, and the actions Many and IfThen.
- OTHER
  All other expressions and actions which don't fit in the above categories.
- EXRAVAGANZA
  Things seldom used, included mostly for fun, but maybe useful in some cases. These are partly included to demonstrate the possibilities that LogixNG offers.