I get the following error for every HTML document when using pagina EPUB-Checker (which uses ePubChecker 3.0.1):
Code:
ERROR: <book name>.epub/ops/xhtml/halftitle2.html(7,108): non-standard stylesheet resource 'ops/styles/page-template.xpgt' of type 'application/vnd.adobe-page-template+xml'. A fallback must be specified.
The HTML files look like:
Code:
<link href="../Styles/9781439100516.css" rel="stylesheet" type="text/css" />
<link href="../Misc/page-template.xpgt" rel="stylesheet" type="application/vnd.adobe-page-template+xml" />
.
FlightCrew reports no problems and neither does the web site
http://validator.idpf.org/application/validate, which I believe uses ePubChecker 3.0.
If I use the Calibre plugin "Modify ePub" and choose "Remove Adobe .xpgt files and links", the resulting ePub now validates perfectly in all tools used.