10 Markup Compatibility and Extensibility

Office Open XML documents are designed to allow for innovation by extending their capabilities, by using (where allowed) the Application-Defined Extension Element extLst specified by this Part of ISO/IEC 29500 or by using the Markup Compatibility and Extensibility features specified by ISO/IEC 29500-3. All the features of ISO/IEC 29500-3 are supported by this Part of ISO/IEC 29500.