# EPUBCheck OPF-015: The property … should not be declared…

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

EPUBCheck OPF-015 is an error message: “The property "…" should not be declared in the OPF file.” A manifest item declares a property (such as svg, mathml or scripted) that the document does not actually use.

- Official message (EPUBCheck 5.4.0): The property "%1$s" should not be declared in the OPF file.
- Default severity: Error

## Typical causes

- Properties copied from a template or left after the SVG, MathML or script was removed.

## How to fix it

- Remove the property EPUBCheck names from the manifest item.

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