# Package org.apache.fop.fo.extensions

Base classes for implementing extensions to XSL-FO.

See: Description

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

Class Summary
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.