EpubCCEPUBCheck OPF-026: malformed property value
Updated:
EPUBCheck OPF-026 is an error message: “Found malformed property value: "…".” A property value is malformed, for example a prefix with nothing after the colon. Property values must be a name, optionally preceded by a prefix and a colon, and nothing else.
The official message
Found malformed property value: "%1$s".
- Default severity
- Error. The EPUB breaks a rule of the specification and is invalid. Stores and Send to Kindle may reject it, and EPUBCheck exits with status 1.
- EPUBCheck version
- 5.4.0
%1$s, %2$s… are filled in with the file, value or element EPUBCheck found.
Typical causes
- Values such as "rendition:" with the name missing.
- Values with spaces or characters that a property name cannot contain.
- A full URI pasted where a short prefixed name was expected.
How to fix it
- Find the value EPUBCheck quotes in the message.
- Rewrite it as prefix:name (for example rendition:layout) or as a plain name from the default vocabulary.
- If the value has a prefix, check that the prefix is reserved or declared in the prefix attribute.
When it's not this
If the value is well formed but unknown, that is OPF-027; if its prefix is undeclared, OPF-028.
Terms used here
Other OPF messages
OPF-025Property value list "…" is not allowed, only one value must be specified.OPF-027Undefined property: "…".OPF-028Undeclared prefix: "…".OPF-029The file "…" does not appear to match the media type …, as specified in the OPF file.OPF-030The unique-identifier "…" was not found.OPF-021Use of non-registered URI scheme type in href: "…".
Sources
Message text and severity from EPUBCheck 5.4.0 (W3C, BSD-3-Clause). Explanation by EpubCC.