Schemas provide specification to USD by defining prim types and attributes more formally. You can extend USD by creating new schema classes to support your data models and workflows.
A schema developed by NVIDIA in collaboration with Pixar and Apple standardizing the representation of mass distribution, collision behavior and other data necessary for rigid-body dynamics. UsdPhysics is now an official USD schema included with USD.
USD Schema Kit Extensions¶
You can add new USD schemas to Kit applications by developing a Kit Extension that loads your custom schema. The Kit documentation provides more information about USD Schema extensions.