| Interface | Description | 
|---|---|
| ApiSupportProvider | Allows api support to be accessed for a given content type. | 
| CommentExtensionsSupport | An internal SPI to allow core comments to be extended by Atlassian | 
| ContentTypeApiSupport<T extends ContentConvertible> | Interface providing extensible content type support in the api | 
| CustomContentApiSupportParams | Bean to provide the parameters for the CustomContentApiSupport class this allows us to continue
 using the constructor injection on the CustomContentTypeApiSupport SPI. | 
| Class | Description | 
|---|---|
| BaseContentTypeApiSupport<T extends ContentConvertible> | A subclass for extensible content type support in the api | 
| CommentExtensionsSupportModuleDescriptor | |
| ContentCreator | ContentCreator contains logic to validate CREATE / UPDATE content operations which involves sanity checks like
 access permission and blank titles. | 
| ContentTypeApiSupportProvider | Provides  ContentTypeApiSupports that are either bundled, or registered with OSGi | 
| CustomContentApiSupportParamsImpl | |
| CustomContentTypeApiSupport | |
| DraftAttributesCopier | |
| NullCommentExtensionsSupport | A null implementation for comment extension support, no additional extension sproperties
 are provided or supported | 
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