Back to Error DirectoryW3C EPUBCheck Standard
OPF-089Critical Ingestion Error

The "alternate" link rel keyword cannot be paired with other keywords.

The "alternate" link rel keyword cannot be paired with other keywords.

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Fix all OPF-089 errors in your EPUB automatically

PreFlight checks for OPF-089 issues in memory and provides 1-click remediation during client-side packaging.

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What This Error Means in Plain English

EPUBCheck detected The "alternate" link rel keyword cannot be paired with other keywords.. 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-089: The "alternate" link rel keyword cannot be paired with other keywords.

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule OPF-089 in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the OPF-089 specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.