"anchor" template outputs invalid XHTML: empty "a" tag

[Raphael Hertzog <raphael@ouaza.com>]

Hello,

I recently reported a bug in publican because it uses the XSL XHTML stylesheets
and overrides the "anchor" template in a way that doesn't always work:
https://bugzilla.redhat.com/show_bug.cgi?id=579069

It turns out the override is there because the current output of the XSL
XHTML stylesheet for the anchor template is invalid XHTML: the "a" tag
cannot be empty apparently.

So they changed the initial template:
<a id="{$id}" />
Into:
<xsl:attribute name="id"><xsl:value-of select="$id"/></xsl:attribute>

But the latter fails at least in 2 cases in the current usage of the
"anchor" template in the HTML stylesheet when it's called somewhere that
is not at the start of a new tag:
- in html/callout.xsl for match="co" mode="co"
- in html/verbatim.xsl for match="programlisting|screen|synopsis"

You'll get errors like:
xsl:attribute: Cannot add attributes to an element if children have been already added to the element.

It would be nice to see this fixed in a way or another so that publican
doesn't have to override the template just to have valid XHTML output.

Cheers,
-- 
Raphaël Hertzog -+- http://www.ouaza.com

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