[xsl] Selecting last text() from fragment of unknown depth?

["Adam Desaulniers" <avalonsunsplashtech@xxxxxxxxxxx>]

With this template

<xsl:template 
match="submission.excerpt//node()/@*|submission.excerpt//node()">
<xsl:copy><xsl:apply-templates select="./@*|./node()" /></xsl:copy>
</xsl:template>

have I made it impossible to also transform (inline) the last occurring 
textnode beneath submission.excerpt/node()?

So far all my recursion attempts (looking for node()[last()][self::text()] 
at each level) have yielded 3 variations: *only* the last text(), everything 
*except* the last text(), or the whole thing and then the last text() 
appended again.

<xsl:choose>
<xsl:when test="./node()[last()][self::text()]">
	<xsl:copy>
		<xsl:apply-templates select="./@*|./node()[position() != last()]" />
		<xsl:value-of select="./node()[last()]" />...
	</xsl:copy>
</xsl:when>
<xsl:otherwise>
	<!-- look again next level, etc -->
</xsl:otherwise>
</xsl:choose>

It's meant to take an XHTML string (truncated from db then made well-formed 
again by PHP5's loadHTML method) and replace the end of the last text() -- 
after the last occuring space character -- with an ellipsis, which I've now 
heard 3x is 'impossible' in XSLT 1.0 but it's not official till I've heard 
it here.

Undying gratitude,
-Adam.

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