# EPUBCheck RSC-015: A fragment identifier is required for…

Source: https://epublab.com/epubcheck/rsc-015/ (updated 2026-11-03)

EPUBCheck RSC-015 is a usage message: “A fragment identifier is required for svg use tag references.” An SVG use element references a file without a fragment identifier; it must point to a specific element with #id.

- Official message (EPUBCheck 5.4.0): A fragment identifier is required for svg use tag references.
- Default severity: Usage

## Typical causes

- A use element written as <use href="icons.svg"/> instead of <use href="icons.svg#star"/>.

## How to fix it

- Add the id of the element to reuse at the end of the reference.

Message text and severity: EPUBCheck (W3C, BSD-3-Clause). Explanation: EPUBLab.