RE: Fwds Compat/Fallback Conformance Puzzles

> 1.
> <y xsl:version="1.1">
>    <xsl:for-each select="//author">
>         <xsl:sort-1.1 select="first-name">
>              <xsl:fallback>
>                   <xsl:sort select="last-name"/>
>              </xsl:fallback>
>         </xsl:sort-1.1>
>    </xsl:for-each>
> </y>

Excuse the naiveté, but what is an XSLT processor expected to do with an
element called sort-1.1?  Shouldn't it raise an error for an unknown XSL
element?

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