## Variable and Command Definitions
Beside these two mandatory attributes (name and identifier), a node may possess several optional attributes.
A node may be annotated with a sequence of local variable definitions. These variables may be of any type that is valid in this node and have to be initialized with a default initialization expression.
### Command Statements
A node may be annotated with a sequence of command statements. Among others, the Textual Expression Language allows the specification of variable assignments, commands which cause the playback of a Scenegroup or a Scene as well as function calls to predefined functions of the underlying implementation language.
Back to Tutorials Index...