This specification, EPUB Canonical Fragment Identifier (epubcfi), defines a standardized method for referencing arbitrary content within an EPUB® Publication through the use of fragment identifiers.
The Web has proven that the concept of hyperlinking is tremendously powerful, but EPUB Publications have been denied much of the benefit that hyperlinking makes possible  because of the lack of a standardized scheme to link into them. Although proprietary schemes have been developed and implemented for individual Reading Systems, without a commonly-understood syntax there has been no way to achieve cross-platform interoperability. The functionality that can see significant benefit from breaking down this barrier, however, is varied: from reading location maintenance to annotation attachment to navigation, the ability to point into any Publication opens a whole new dimension not previously available to developers and Authors.st edition 2020-02 Information technology — Digital publishing — EPUB 3.0.1 — Part 6: Canonical fragment identifiers Technologies de l'information — Publications numériques — EPUB 3.0.1 — Partie？6:？Identificateurs？de？fragment？canoniques Reference number ISO/IEC 23736-6:2020(E) ？ ISO/IEC 2020 ISO/IEC 23736-6:2020(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO/IEC 202