Back to Error DirectoryW3C EPUBCheck Standard
OPF-086_SUG.onix-recordCritical Ingestion Error

the "record" keyword with the properties attribute value "onix"

the "record" keyword with the properties attribute value "onix"

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What This Error Means in Plain English

EPUBCheck detected the "record" keyword with the properties attribute value "onix". Digital reading systems and bookstores require standard conformance to ensure compatibility across all reading apps.

Why Retailers & EAA Regulations Block This File

Automated book distributors (Apple Books, Amazon KDP, Kobo, and IngramSpark) run strict EPUBCheck validation on ingest and reject non-compliant files.

Technical Specification: W3C EPUBCheck rule OPF-086_SUG.onix-record: the "record" keyword with the properties attribute value "onix"

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule OPF-086_SUG.onix-record in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the OPF-086_SUG.onix-record specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.