Sorting and grouping with xsl:analyze

Hello,

I am having trouble grouping and sorting a string. From a previous post (RE:
 Function to Extract integer from string), I extract some integers from
a string. Now I am trying to group & sort those integers. The following XSLT
outputs to html:

<xsl:for-each-group select="$XML1/manual/title/document(.)//Title"
group-by=".">
	<xsl:if test="contains(., ''')">
		<xsl:variable name="chap" select="."/>
			<xsl:variable name="all" select="replace(.,'[^
0-9\.]','')"/>
			<xsl:variable name="numbers" as="xs:string*">
				<xsl:analyze-string select="."
regex="\d+\.?\d*">
					<xsl:matching-substring>
						<xsl:sequence select="."/>
					</xsl:matching-substring>
				</xsl:analyze-string>
			</xsl:variable>
		<xsl:for-each-group select="current-group()"
group-by="$numbers">
		<xsl:sort/>
		<xsl:for-each select="current-grouping-key()">
			<xsl:value-of select="."/>
			<p/>
			</xsl:for-each>
		</xsl:for-each-group>
	</xsl:if>
</xsl:for-each-group>

The XML file looks like this:

<manual>
	<title>MelChapter1.xml</title>
	<title>Chapter9a.xml</title>
</manual>



The Results look like this:

21.197
21.197
21.199
91.407
1
121.133
91.12
121.135

I want to have it look like this:
1
21.197
21.199
91.12
91.407
121.133
121.135

Any help would be great.

Phil