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EPUBCheck · Package document (OPF)

OPF-025

Updated:

EPUBCheck OPF-025 is an error message: “Property value list "…" is not allowed, only one value must be specified.” A metadata property that takes a single value was given a list of values.

The official message

Property value list "%1$s" is not allowed, only one value must be specified.

Default severity
Error. The EPUB breaks a rule of the specification and is invalid. Stores and Send to Kindle may reject it, and EPUBCheck exits with status 1.
EPUBCheck version
5.4.0

%1$s, %2$s… are filled in with the file, value or element EPUBCheck found.

Typical causes

  • Several space-separated values in a property meant to hold one, for example two layout values in one rendition meta element.

How to fix it

  • Keep a single value. If you need different values for parts of the book, set them per item in the spine where the property allows it.

Terms used here

Other OPF messages

  • OPF-026 Found malformed property value: "…".
  • OPF-027 Undefined property: "…".
  • OPF-028 Undeclared prefix: "…".
  • OPF-021 Use of non-registered URI scheme type in href: "…".
  • OPF-029 The file "…" does not appear to match the media type …, as specified in the OPF file.
  • OPF-030 The unique-identifier "…" was not found.

Message text and severity from EPUBCheck 5.4.0 (W3C, BSD-3-Clause). Explanation by EPUBLab.

FAQ

What does EPUBCheck OPF-025 mean?

EPUBCheck OPF-025 is an error message: “Property value list "…" is not allowed, only one value must be specified.” A metadata property that takes a single value was given a list of values.

Is OPF-025 an error?

OPF-025 is reported as error by default. The EPUB breaks a rule of the specification and is invalid. Stores and Send to Kindle may reject it, and EPUBCheck exits with status 1.