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EPUBCheck · XHTML content documents

HTM-011

Updated:

EPUBCheck HTM-011 is an error message: “Entity is undeclared.” A named entity is used that the document does not declare; XML only knows &, <, >, " and '.

The official message

Entity is undeclared.

EPUBCheck's suggestion: Define the entity or use the numbered entity instead.

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

  • HTML entities such as  , — or © in XHTML.

How to fix it

  • Use numeric references (  for a non-breaking space, — for an em dash) or type the character itself in UTF-8.

Terms used here

Other HTM messages

  • HTM-010 Namespace "…" is unusual for the prefix "epub".
  • HTM-009 The DOCTYPE provided is obsolete or irregular and can be removed.
  • HTM-004 Irregular DOCTYPE: found "…", expected "…".
  • HTM-003 External entities are not allowed in EPUB v3 documents. External entity declaration found: ….
  • HTM-025 Non-registered URI scheme type found in href.
  • HTM-045 Encountered empty href.

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

FAQ

What does EPUBCheck HTM-011 mean?

EPUBCheck HTM-011 is an error message: “Entity is undeclared.” A named entity is used that the document does not declare; XML only knows &, <, >, " and '.

Is HTM-011 an error?

HTM-011 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.