---
title: Metadata Identifier Keyspaces
framework: coremedia
role: collectionGroup
role_heading: API Collection
path: coremedia/metadata-identifier-keyspaces
---

# Metadata Identifier Keyspaces

Constants that describe metadata identifier keyspaces.

## Topics

### Constants

- [kCMMetadataKeySpace_QuickTimeUserData](coremedia/kcmmetadatakeyspace_quicktimeuserdata.md)
- [kCMMetadataKeySpace_ISOUserData](coremedia/kcmmetadatakeyspace_isouserdata.md)
- [kCMMetadataKeySpace_QuickTimeMetadata](coremedia/kcmmetadatakeyspace_quicktimemetadata.md)
- [kCMMetadataKeySpace_iTunes](coremedia/kcmmetadatakeyspace_itunes.md)
- [kCMMetadataKeySpace_ID3](coremedia/kcmmetadatakeyspace_id3.md)
- [kCMMetadataKeySpace_Icy](coremedia/kcmmetadatakeyspace_icy.md)
- [kCMMetadataKeySpace_HLSDateRange](coremedia/kcmmetadatakeyspace_hlsdaterange.md)

## See Also

### Constants

- [Metadata Identifier Error Codes](coremedia/metadata-identifier-errors.md)
- [Metadata Registry Error Codes](coremedia/metadata-registry-errors.md)
- [Metadata Identifiers](coremedia/metadata-identifiers.md)
- [Metadata Base Data Types](coremedia/metadata-base-data-types.md)
- [Metadata Data Types](coremedia/metadata-data-types.md)