Uttered Christian Huegel <christian.huegel(a)redhatforum.net>, spake thus:
The line:
<xref linkend="ch-tutorial"><xref> and <xref
linkend="s1-tutorial-parent"></xref>
Well, actually, since the content model for <xref> is EMPTY, the
proper form should be:
<xref linkend="foo" />
Cheers!