What is EpubCheck 4.0.2 "--usage" Option?

EpubCheck 4.0.2 "--usage" option provides you suggested usages of additional EPUB features.

You can try it on Hello-3.0.epub:

\fyicenter>java -jar epubcheck-4.0.2\epubcheck.jar --usage Hello-3.0.epub

Validating using EPUB version 3.0.1 rules.
USAGE(ACC-007): Hello-3.0.epub/content.xhtml(-1,-1): Content Documents do not use 
'epub:type' attributes for semantic inflection.

USAGE(ACC-008): Hello-3.0.epub/Hello-3.0.epub(-1,-1): Navigation Document has no
'landmarks nav' element.

USAGE(HTM-020): Hello-3.0.epub/navigation.xhtml(-1,-1): Content file doesn't contain 
xml:lang attribute.

USAGE(HTM-021): Hello-3.0.epub/navigation.xhtml(-1,-1): Content file doesn't contain 
lang attribute.

USAGE(HTM-020): Hello-3.0.epub/content.xhtml(-1,-1): Content file doesn't contain 
xml:lang attribute.

USAGE(HTM-021): Hello-3.0.epub/content.xhtml(-1,-1): Content file doesn't contain lang attribute.

No errors or warnings detected.
epubcheck completed

Okay. Hello-3.0.epub can be improved by implementing these suggested features.

⇒ EpubCheck 4.0.2 --out Option

⇐ EpubCheck 4.0.2 Command Options

⇑ EPUB Validator - epubcheck.jar

⇑⇑ EPUB Tutorials