# Preliminary_Behavior A typed schema that combines one or more triggers with associated actions. ## Discussion Because it inherits `Typed`, this schema declares a `Preliminary_Behavior` as a type of prim. For more information about typed schemas, see USD Specification > [Typed](http://graphics.pixar.com/usd/docs/USD-Glossary.html#USDGlossary-TypedSchema). To run actions based on a trigger, an asset defines a prim of this type and sets its [triggers](/documentation/USD/triggers) and [actions](/documentation/USD/actions). ### Declaration ```other class Preliminary_Behavior "Preliminary_Behavior" ( inherits = ) ``` ### Trigger animation for a tapped cube The following example demonstrates a behavior that applies an `EmphasizeAction` to a cube to flip it. Because the cube defines a tap trigger, the runtime performs the flip when a user taps the cube in an AR experience. ```other #usda 1.0 def Preliminary_Behavior "TapAndFlip" { rel triggers = [ ] rel actions = [ ] def Preliminary_Trigger "Tap" ( inherits = ) { rel affectedObjects = [ ] } def Preliminary_Action "Entry" ( inherits = ) { uniform token type = "parallel" rel actions = [ ] } def Preliminary_Action "Flip" ( inherits = ) { rel affectedObjects = [ ] uniform token motionType = "flip" } } def Cube "Cube" { } ``` ## Topics ### Properties [triggers](/documentation/USD/triggers) A list of prims that execute a behavior’s actions. [actions](/documentation/USD/actions) A list of actions that make up the group. [exclusive](/documentation/USD/exclusive) A Boolean value that determines if a behavior executes exclusively. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)