---
title: "CMMetadataDataTypeRegistryDataTypeIsRegistered(_:)"
framework: coremedia
role: symbol
role_heading: Function
path: "coremedia/cmmetadatadatatyperegistrydatatypeisregistered(_:)"
---

# CMMetadataDataTypeRegistryDataTypeIsRegistered(_:)

Returns a Boolean value that indicates the registration status of a data type identifier.

## Declaration

```swift
func CMMetadataDataTypeRegistryDataTypeIsRegistered(_ dataType: CFString) -> Bool
```

## Parameters

- `dataType`: Identifier of the data type to be checked.

## Return Value

Return Value kCFBooleanTrue if the data type has been registered; kCFBooleanFalse otherwise.

## See Also

### Inspecting Metadata

- [CMMetadataDataTypeRegistryGetDataTypeDescription(_:)](coremedia/cmmetadatadatatyperegistrygetdatatypedescription(_:).md)
- [CMMetadataDataTypeRegistryGetConformingDataTypes(_:)](coremedia/cmmetadatadatatyperegistrygetconformingdatatypes(_:).md)
- [CMMetadataDataTypeRegistryDataTypeConformsToDataType(_:conformsTo:)](coremedia/cmmetadatadatatyperegistrydatatypeconformstodatatype(_:conformsto:).md)
- [CMMetadataDataTypeRegistryDataTypeIsBaseDataType(_:)](coremedia/cmmetadatadatatyperegistrydatatypeisbasedatatype(_:).md)
- [CMMetadataDataTypeRegistryGetBaseDataTypeForConformingDataType(_:)](coremedia/cmmetadatadatatyperegistrygetbasedatatypeforconformingdatatype(_:).md)
- [CMMetadataDataTypeRegistryGetBaseDataTypes()](coremedia/cmmetadatadatatyperegistrygetbasedatatypes().md)