Nordic EPUB3 Navigation Document content reference rules

Rule ID Rule description
nordic_nav_references_1 All headings in the content documents must be referenced exactly once in the navigation document. In the content document "...", the ... "..." element... is ... from the navigation document.
nordic_nav_references_1 The text for the heading in the navigation document ("...") should match the headline in the content document ("..." at ...)
nordic_nav_references_2a All references from the navigation document must reference either a sectioning element or a headline in one of the content documents: ...
nordic_nav_references_2a All references from the navigation document must reference exactly one sectioning element or headline in one of the content documents, there are multiple sections or headlines matching the href="..." in ...; ...
nordic_nav_references_2b The nesting of headlines in the content does not match the nesting of headlines in the navigation document. The toc item `...` in the navigation document is not nested at the correct level. The referenced document (...) occurs in the navigation document at nesting depth ... (...). The referenced headline (...) occurs in the navigation document at nesting depth ... (...). The referenced headline (`<......>...</...>) occurs in the content document ... as a `...` which implies that it should be referenced at nesting depth ... in the navigation document.
nordic_nav_references_3 All pagebreaks in the content documents must be referenced exactly once in the navigation document. In the content document "...", the pagebreak "..."... is ... from the navigation document.
nordic_nav_references_3 The page number for the pagebreak in the navigation document ("...") should match the page number of the referenced pagebreak in the content document ("..." at ...)
nordic_nav_references_3 The page number for the pagebreak in the navigation document ("...") should be a dash ("-") when the referenced pagebreak in the content document is unnumbered ("..." at ...)
nordic_nav_references_4 The page list in the navigation document must reference the pagebreaks in the correct order. The pagebreak with id="..." in the document "..." is referenced from the navigation document after the pagebreak with id="..." in the document "...", but in the content document it occurs before it.