Properties

# VASSAL Reference Manual Home > Module > Game Piece Palette > Game Piece > Properties
## Properties
Each Game Piece has its own set of properties (each with a name and a value) that can be used for identification by various components. Properties can be defined for a Zone, a Map or for the entire module. If a property is not defined in a Game Piece, the program looks for the value in the Map containing the piece, then in the module. Properties can be matched using expressions like name = value for an exact match, name != value for a non-match, or name =~ value for a regular expression match. For properties that return a numeric value (e.g. the level in a Layer) you can use <, <=, >, and >=. You can combine expressions using && for logical AND and || for a logical OR. Components that use properties Any Message Format defined in a Game Piece will substitute values for the properties defined on that Game Piece The Global Key Command component uses properties to determine which pieces will respond to the command. The Game Piece Layers component uses properties to determine relative ordering when drawing pieces on the map. The Trigger Action trait uses properties to determine when to fire a keyboard command. The Text Label trait substitutes properties when setting the text of the label. A Zone uses properties to specify a Zone Highlighter. Properties defined by Game Pieces The Basic Piece defines properties related to a piece's name, location, side, and whether it's selected The Layer trait defines properties related to the state of that Layer The Rotate trait defines properties related to the current facing of the piece. The Text Label trait returns the value of the label as a property The Marker trait allows you to define your own static properties The Dynamic Property trait allows you to define your own changeable properties. The Mark When Moved trait sets a property when a piece has moved The Mask trait sets a property when the piece is masked The Invisible trait sets a property when the piece is invisible The Property Sheet trait exposes a set of user-editable properties. Properties defined by other components The Global Property component defines properties for a Zone, Map or the module. The Global Options component allows you to tie property values to preferences settings. The results of a roll by a Dice Button is exposed as a property A Deck component exposes the number of cards remaining as a Map-level property.