I have problems to read this format by atril. Atril crashes with a
segmentation fault:
/tmp/atril-65485/darktable_user_manual_en-4.4.epubCR7961/OEBPS/toc.ncx:10:
parser error : Opening and ending tag mismatch: meta line 5 and
head
</head>
^
/tmp/atril-65485/darktable_user_manual_en-4.4.epubCR7961/OEBPS/toc.ncx:2245:
parser error : Opening and ending tag mismatch: head line 4 and
ncx
</ncx>
^
/tmp/atril-65485/darktable_user_manual_en-4.4.epubCR7961/OEBPS/toc.ncx:2246:
parser error : Premature end of data in tag ncx line 2
^
[1] 65485 segmentation fault atril
darktable_user_manual_en-4.4.epub
So I checked this EPUB by 'epubcheck', which doesn't look very
nice:
epubcheck darktable_user_manual_en-4.4.epub 2>& 1|grep -E
"^(FATAL|ERROR)"
ERROR(RSC-005):
darktable_user_manual_en-4.4.epub/OEBPS/content.opf(23,44): Error
while parsing file: character content of element "meta" invalid;
must be a string with length at least 1 (actual length was 0)
ERROR(RSC-005):
darktable_user_manual_en-4.4.epub/OEBPS/toc.ncx(6,53): Error while
parsing file: element "meta" not allowed here; expected the
element end-tag
ERROR(RSC-005):
darktable_user_manual_en-4.4.epub/OEBPS/toc.ncx(7,46): Error while
parsing file: element "meta" not allowed here; expected the
element end-tag
ERROR(RSC-005):
darktable_user_manual_en-4.4.epub/OEBPS/toc.ncx(8,55): Error while
parsing file: element "meta" not allowed here; expected the
element end-tag
ERROR(RSC-005):
darktable_user_manual_en-4.4.epub/OEBPS/toc.ncx(9,54): Error while
parsing file: element "meta" not allowed here; expected the
element end-tag
FATAL(RSC-016):
darktable_user_manual_en-4.4.epub/OEBPS/toc.ncx(10,5): Fatal Error
while parsing file: The element type "meta" must be terminated by
the matching end-tag "</meta>".
ERROR(RSC-005):
darktable_user_manual_en-4.4.epub/OEBPS/toc.ncx(-1,-1): Error
while parsing file: The element type "meta" must be terminated by
the matching end-tag "</meta>".
ERROR(RSC-005):
darktable_user_manual_en-4.4.epub/OEBPS/toc.xhtml(6,10): Error
while parsing file: element "title" not allowed here; expected the
element end-tag
ERROR(RSC-005):
darktable_user_manual_en-4.4.epub/OEBPS/toc.xhtml(11,59): Error
while parsing file: element "link" not allowed here; expected the
element end-tag
FATAL(RSC-016):
darktable_user_manual_en-4.4.epub/OEBPS/toc.xhtml(13,4): Fatal
Error while parsing file: The element type "meta" must be
terminated by the matching end-tag "</meta>".
ERROR(RSC-005):
darktable_user_manual_en-4.4.epub/OEBPS/toc.xhtml(-1,-1): Error
while parsing file: The element type "meta" must be terminated by
the matching end-tag "</meta>".
ERROR(RSC-005):
darktable_user_manual_en-4.4.epub/OEBPS/index.html(10,59): Error
while parsing file: element "link" not allowed here; expected the
element end-tag
FATAL(RSC-016):
darktable_user_manual_en-4.4.epub/OEBPS/index.html(12,3): Fatal
Error while parsing file: The element type "meta" must be
terminated by the matching end-tag "</meta>".
ERROR(RSC-005):
darktable_user_manual_en-4.4.epub/OEBPS/index.html(-1,-1): Error
while parsing file: The element type "meta" must be terminated by
the matching end-tag "</meta>".
ERROR(RSC-005):
darktable_user_manual_en-4.4.epub/OEBPS/front-cover.html(3,30):
Error while parsing file: value of attribute "xml:lang" is
invalid; must be an RFC 3066 language identifier or must be equal
to ""
ERROR(RSC-005):
darktable_user_manual_en-4.4.epub/OEBPS/front-cover.html(4,11):
Error while parsing file: element "body" not allowed yet; missing
required element "head"
ERROR(CSS-008):
darktable_user_manual_en-4.4.epub/OEBPS/style.css(146,3): An error
occurred while parsing the CSS: Token "@top-left-corner" not
allowed here, expecting a property name.
ERROR(CSS-008):
darktable_user_manual_en-4.4.epub/OEBPS/style.css(165,22): An
error occurred while parsing the CSS: Token "}" not allowed here.
ERROR(CSS-008):
darktable_user_manual_en-4.4.epub/OEBPS/style.css(212,3): An error
occurred while parsing the CSS: Token "@top-left-corner" not
allowed here, expecting a property name.
ERROR(CSS-008):
darktable_user_manual_en-4.4.epub/OEBPS/style.css(231,20): An
error occurred while parsing the CSS: Token "}" not allowed here.
FATAL(RSC-016):
darktable_user_manual_en-4.4.epub/OEBPS/module-reference/utility-modules/shared/metadata-editor.html(25,129):
Fatal Error while parsing file: Attribute name "unchanged"
associated with an element type "leave" must be followed by the '
= ' character.
ERROR(RSC-005):
darktable_user_manual_en-4.4.epub/OEBPS/module-reference/utility-modules/shared/metadata-editor.html(-1,-1):
Error while parsing file: Attribute name "unchanged" associated
with an element type "leave" must be followed by the ' = '
character.
ERROR(RSC-008):
darktable_user_manual_en-4.4.epub/OEBPS/style.css(137,5):
Referenced resource "OEBPS/darktable-logo.svg" is not declared in
the OPF manifest.
ERROR(RSC-007):
darktable_user_manual_en-4.4.epub/OEBPS/lighttable/digital-asset-management/thumbnails.html(31,343):
Referenced resource "special-topics/memory.md" could not be found
in the EPUB.
ERROR(RSC-007):
darktable_user_manual_en-4.4.epub/OEBPS/lighttable/digital-asset-management/thumbnails.html(52,267):
Referenced resource "special-topics/memory.md" could not be found
in the EPUB.
ERROR(RSC-007):
darktable_user_manual_en-4.4.epub/OEBPS/module-reference/processing-modules/vignetting.html(49,398):
Referenced resource
"OEBPS/module-reference/processing-modules/dithering.md" could not
be found in the EPUB.
ERROR(RSC-012):
darktable_user_manual_en-4.4.epub/OEBPS/module-reference/utility-modules/shared/collection-filters.html(29,96):
Fragment identifier is not defined.
ERROR(RSC-012):
darktable_user_manual_en-4.4.epub/OEBPS/preferences-settings/miscellaneous.html(42,386):
Fragment identifier is not defined.
(There are many WARNINGS too.)
Is there a way to make the EPUB format better readable (parsable)?
I don't know which tool is used to create the EPUB.
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