# PDF Entity Type Definitions

Definitions of type of PDF entities.

This section describes the entity types used for the PDF entities. The types are grouped into the following modules in this reference.

- Document / Page
- Layout
- 3D
- Interactivity

Topics

- Document Type Declarations
- Layout Static Type Declarations
- Layout Widget Type Declarations
- 3D Type Declarations
- Interactivity Type Declarations
- Interactivity Advanced Type Declarations

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