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EPUBCheck · Package document (OPF)

OPF-066

Updated:

EPUBCheck OPF-066 is an error message: “Missing "dc:source" or "source-of" pagination metadata. The pagination source must be identified using the "dc:source" and "source-of" properties when the content includes page break markers.” The content marks print page breaks but the metadata does not say which print edition the page numbers come from.

The official message

Missing "dc:source" or "source-of" pagination metadata. The pagination source must be identified using the "dc:source" and "source-of" properties when the content includes page break markers.

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

Typical causes

  • Page-break markers or a page list added without identifying the source edition.

How to fix it

  • Identify the source with dc:source and refine it with source-of, for example <dc:source id="src">urn:isbn:…</dc:source> and <meta refines="#src" property="source-of">pagination</meta>.

Terms used here

Other OPF messages

  • OPF-065 Invalid metadata declaration, probably due to a cycle in "refines" metadata.
  • OPF-067 The resource "…" must not be listed both as a "link" element in the package metadata and as a manifest item.
  • OPF-062 Found Adobe page-map attribute on spine element in opf file.
  • OPF-060 Duplicate entry in the ZIP file: "…" (file names must be unique after Unicode canonical normalization and full case folding).
  • OPF-074 Package resource "…" is declared in several manifest items.

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

FAQ

What does EPUBCheck OPF-066 mean?

EPUBCheck OPF-066 is an error message: “Missing "dc:source" or "source-of" pagination metadata. The pagination source must be identified using the "dc:source" and "source-of" properties when the content includes page break markers.” The content marks print page breaks but the metadata does not say which print edition the page numbers come from.

Is OPF-066 an error?

OPF-066 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.