# Package org.apache.fop.fo.extensions

Base classes for implementing extensions to XSL-FO.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  ExtensionAttachment | This interface is implemented by objects that are returned by special extension element through the FONode.getExtensionAttachment() method.

- Class Summary
  Class | Description
  --- | ---
  ExtensionElementMapping | Element mapping for FOP's proprietary extension to XSL-FO.
  ExternalDocument | Class for the fox:external-document extension element.
  InternalElementMapping | Element mapping for FOP's internal extension to XSL-FO.
  OldExtensionElementMapping | Element mapping for the old FOP extension namespace.

## Package org.apache.fop.fo.extensions Description

Base classes for implementing extensions to XSL-FO.

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