<xsl:template match="*">
<xsl:message>unexpected element encountered: <xsl:value-of select="name()"
/></xsl:message>
</xsl:template>
as always, a match template only executes if you apply templates to a
matching node. that version makes a warning and doesn't process
children. If you want to process children then
<xsl:template match="*">
<xsl:message>unexpected element encountered: <xsl:value-of select="name()"
/></xsl:message>
<xsl:apply-templates/>
</xsl:template>
I use either form, depending. If I haven't got round to supporting
mathml yet I'd rather get one warning for each mathml:math element
at the top level of each expression in the document, I don't really want
to be told on every character of every expression that I haven't yet
supported mathml:mi, so I'd use the first form. In other cases, the
second form, processing children is more useful.
Other variants:
<xsl:template match="*">
<xsl:message>unexpected element encountered: <xsl:value-of select="name()"
/></xsl:message>
<div class="error">
<span>unexpected element encountered: <xsl:value-of select="name()" /></span>
<xsl:apply-templates/>
</div>
</xsl:template>
so that you not only get a warning, but also a big red block of stuff in
the output.
David
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