Composition is the process that assembles multiple layers together by the composition arcs that relate them to each other, resulting in a UsdStage scenegraph of UsdPrims. Each UsdPrim contains an index that allows clients to subsequently extract “resolved values” for properties and metadata from the relevant layers. Composition occurs when first opening a UsdStage, when loading or unloading prims on the stage, and when layers that contribute to the stage are edited. One of the results of composition is path translation so that all the data in all layers contributing to the scene are accessed by their “scene level” namespace locations (paths). We also sometimes refer to “a composition” or “a composed prim” or “a composed scene”, in which contexts we are referring to the result of performing composition.