The <param> element currently declares its content to be "macro.xpath"
-- i.e. it can contain only an XPath.
It would be a lot easier to enforce this constraint if the content were
supplied as an attribute, e.g. "value"
so, eg, instead of
<param name="foo">@bar</param>
<param name="default">corr</param>
<param name="lang">ancestor::*/@xml:lang</param>
<param name="place">'foot'</param>
I suggest
<param name="foo" value="@bar"/>
<param name="default" value="corr"/>
<param name="lang" value="ancestor::*/@xml:lang"/>
<param name="place" value="'foot'"/>
Anyone got strong feelings against this change? The @place example looks
a bit dodgy, but otherwise it seems a fairly benign enhancement.
