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### 4.1 Conventions

- Common syntax: Syntax Common to All OOGL File Formats.
- File names: File Names.
- Vertices: Vertices.
- ND-Vertices: N-dimensional Vertices.
- Surface normal directions: Surface normal directions.
- Transformation matrices: Transformation matrices.
- ND Transformation matrices: N-dimensional transformation matrices.
- Binary format: Binary format.
- References: Embedded objetos and external-objeto references.
- Appearances: Appearances.
- Texture Mapping: Texture mapping.