I'm generating epub from Docbook input and getting during the validation one error and one warning with regards to the Doctype.
[java] Epubcheck Version 3.0
[java] Validating against EPUB version 2.0
[java] ERROR: /home/vogella/workspace/docu/de.vogella.publishing/../output/epub/book.epub/OEBPS/content.opf: Obsolete or irregular DOCTYPE statement. The DOCTYPE can be removed.
[java] WARNING: /home/vogella/workspace/docu/de.vogella.publishing/../output/epub/book.epub/OEBPS/toc.ncx: Irregular DOCTYPE: found '-//W3C//DTD XHTML 1.1//EN', expecting '<!DOCTYPE ncx PUBLIC "-//NISO//DTD ncx 2005-1//EN" "
http://www.daisy.org/z3986/2005/ncx-2005-1.dtd">'.
My input looks simular to the XML file listed below.
Any advice how to remove this error? I'm using DocBook XSL 1.77 for the transformation.
<?xml version="1.0"?>
<book>
<bookinfo>
<title>Java programming with the Eclipse IDE</title>
<firstname>Lars</firstname>
<surname>Vogel</surname>
</author>
<copyright>
<year>2007</year>
<holder> Lars Vogel</holder>
</copyright>
<pubdate>17.02.2013</pubdate>
<releaseinfo>Third edition
</releaseinfo>
<mediaobject role="cover">
<imageobject id="cover-image">
<imagedata fileref="images/cover.png" align="center" />
</imageobject>
</mediaobject>
</bookinfo>
<title>Eclipse Overview</title>
<chapter>
<title>Eclipse overview
and terminology
</title>
<para> This chapter gives a short introduction into
the Eclipse
project and the Eclipse IDE.
</para>
</chapter>
<part>
</book>