---
title: Metadata Format Description Constants
framework: coremedia
role: collectionGroup
role_heading: API Collection
path: coremedia/metadata-format-description-constants
---

# Metadata Format Description Constants

Constants that identify metadata format descriptions.

## Topics

### Constants

- [kCMMetadataBaseDataType_AffineTransformF64](coremedia/kcmmetadatabasedatatype_affinetransformf64.md)
- [kCMMetadataFormatDescriptionKey_ConformingDataTypes](coremedia/kcmmetadataformatdescriptionkey_conformingdatatypes.md)
- [kCMMetadataFormatDescriptionKey_DataType](coremedia/kcmmetadataformatdescriptionkey_datatype.md)
- [kCMMetadataFormatDescriptionKey_DataTypeNamespace](coremedia/kcmmetadataformatdescriptionkey_datatypenamespace.md)
- [kCMMetadataFormatDescriptionKey_LanguageTag](coremedia/kcmmetadataformatdescriptionkey_languagetag.md)
- [kCMMetadataFormatDescriptionKey_LocalID](coremedia/kcmmetadataformatdescriptionkey_localid.md)
- [kCMMetadataFormatDescriptionKey_Namespace](coremedia/kcmmetadataformatdescriptionkey_namespace.md)
- [kCMMetadataFormatDescriptionKey_SetupData](coremedia/kcmmetadataformatdescriptionkey_setupdata.md)
- [kCMMetadataFormatDescriptionKey_StructuralDependency](coremedia/kcmmetadataformatdescriptionkey_structuraldependency.md)
- [kCMMetadataFormatDescriptionKey_Value](coremedia/kcmmetadataformatdescriptionkey_value.md)
- [kCMMetadataFormatDescriptionMetadataSpecificationKey_DataType](coremedia/kcmmetadataformatdescriptionmetadataspecificationkey_datatype.md)
- [kCMMetadataFormatDescriptionMetadataSpecificationKey_ExtendedLanguageTag](coremedia/kcmmetadataformatdescriptionmetadataspecificationkey_extendedlanguagetag.md)
- [kCMMetadataFormatDescriptionMetadataSpecificationKey_Identifier](coremedia/kcmmetadataformatdescriptionmetadataspecificationkey_identifier.md)
- [kCMMetadataFormatDescriptionMetadataSpecificationKey_SetupData](coremedia/kcmmetadataformatdescriptionmetadataspecificationkey_setupdata.md)
- [kCMMetadataFormatDescriptionMetadataSpecificationKey_StructuralDependency](coremedia/kcmmetadataformatdescriptionmetadataspecificationkey_structuraldependency.md)
- [kCMMetadataFormatDescription_StructuralDependencyKey_DependencyIsInvalidFlag](coremedia/kcmmetadataformatdescription_structuraldependencykey_dependencyisinvalidflag.md)

## See Also

### Constants

- [Audio Format Description Mask Codes](coremedia/audio-format-desc-codes.md)
- [Chroma Location Extension Constants](coremedia/chroma-location-extension-constants.md)
- [Clean Aperture Extension Constants](coremedia/clean-aperture-extension-constants.md)
- [Closed Caption Format Type Constants](coremedia/closed-caption-formats.md)
- [Color Primary Extension Constants](coremedia/color-primary-extension-constants.md)
- [Field Detail Extension Constants](coremedia/field-detail-extension-constants.md)
- [Format Description Bridge Error Codes](coremedia/format-description-bridge-errors.md)
- [Format Description Constants](coremedia/format-description-constants.md)
- [Format Description Error Codes](coremedia/format-description-errors.md)
- [HEVC Temporal Level Info Constants](coremedia/hevc-temporal-level-info-constants.md)
- [MPEG-2-conformant Formats](coremedia/mpeg-2-conformant-formats.md)
- [Pixel Aspect Ratio Extension Constants](coremedia/pixel-aspect-ratio-extension-constants.md)
- [Text Display Flags](coremedia/text-display-flags.md)
- [Text Format Constants](coremedia/text-format-constants.md)
- [Text Format Description Constants](coremedia/text-format-description-constants.md)