Title: Metadata Specifiers
Crumbs:%ROOT%, Programming, Programming/UnrealArchitecture/Reference
Description: Metadata keywords used when declaring classes, functions, and interfaces to specify how they behave with various aspects of the engine and editor.
Availability:Public
Version: 4.9

When declaring classes, functions, and interfaces, metadata specifiers can be added to the declaration to control how they behave with various
aspects of the engine and editor.

[EXCERPT:MetadataUsage]
The usage of metadata specifiers differs between regular classes, functions, and interfaces.
[/EXCERPT:MetadataUsage]

To use metadata specifies, use the meta specifier in a `UCLASS`, `UINTERFACE`, or `UFUNCTION` macro:

    UCLASS(meta=(BlueprintSpawnableComponent))

## Class Metadata Specifiers
[EXCERPT:ClassMetadata]
Classes can use the following metatag specifier:
* [](Programming\UnrealArchitecture\Reference\Metadata\BlueprintSpawnableComponent)
[/EXCERPT:ClassMetadata]


## Function Metadata Specifiers
[EXCERPT:FunctionMetadata]
Functions can use the following metatag specifiers:
* [](Programming\UnrealArchitecture\Reference\Metadata\BlueprintInternalUseOnly)
* [](Programming\UnrealArchitecture\Reference\Metadata\BlueprintProtected)
* [](Programming\UnrealArchitecture\Reference\Metadata\DeprecatedFunction)
* [](Programming\UnrealArchitecture\Reference\Metadata\DeprecationMessage)
* [](Programming\UnrealArchitecture\Reference\Metadata\UnsafeDuringActorConstruction)
[/EXCERPT:FunctionMetadata]


## Interface Metadata Specifiers
[EXCERPT:InterfaceMetadata]
Interfaces can use the following metatag specifier:
* [](Programming\UnrealArchitecture\Reference\Metadata\CannotImplementInterfaceBlueprint)
[/EXCERPT:InterfaceMetadata]