# Geometrical dimensioning tolerance

> 4.0

A markup GDT is composed of appended texts and an array of tolerances. Tolerances that can be of two types :

- features control frame tolerance (ref `A3DMDFeatureControlFrameData`).
- Tolerances Sizes (ref `A3DMDToleranceSizeData`). which allow to define all the dimension of an element. For example for a hole we can have a tolerance size that will contain the value of the diameter, the value of the depth and the angle defining the V shape at the bottom of the hole.

Returns

> `A3D_SUCCESS`on success, or an error code on failure

Topics

- Tolerance size
- Feature control frame

Structures

- `A3DMarkupGDTData`

Functions

- `A3DMDFCFRowDatumCreate()`
- `A3DMDFCFDrawingRowCreate()`
- `A3DMDFeatureControlFrameCreate()`
- `A3DMarkupGDTCreate()`
- `A3DMDFCValueCreate()`
- `A3DMDFCTolerancePerUnitCreate()`
- `A3DMDFCProjectedZoneCreate()`
- `A3DMDFCFToleranceValueCreate()`
- `A3DMarkupGDTGet()`

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