# Entity Type Definitions

Definitions of type of PRC entities.

This section describes the entity types used for the PRC entities defined in the*PRC Format Specification*. Every type corresponds to a unique entry in the `A3DEEntityType`enumerator. The types are grouped into the following modules in this reference.

- Root types
- Structure
- Geometry
- Topology
- Tessellation
- Markup
- Texture
- Graphics
- Miscellaneous data

Topics

- Entity Constants
- Root Type Declarations
- Structure Type Declarations
- Representation Item Type Declarations
- Tessellation Type Declarations
- Topology Type Declarations
- Geometry Type Declarations
- Markup Type Declarations
- Graphics Type Declarations
- Miscellaneous Type Declarations
- Drawing Type Declarations
- Feature Type Declarations
- Constraint Type Declarations
- Topological item owners
- BIM Type Declarations
- Publication Type Declarations

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