Custom filter and sort using xslt

Is it possible to use a query string to select items from a list and order them?

For instance my page & query string

SortFilter.aspx?selection='i13o1,i5o2,i27o3,'

(i is for Item, O is for Order)

I know how to get the querystring, and create a variable the contains 'o' for each selected item 'i', but can't figure out how to use 'o' for sorting

    <xsl:for-each select="/dsQueryResponse/Rows/Row[generate-id(.)=generate-id(key('myKey',@ID))]">


     <xsl:variable name="articleNumber">
            <xsl:text>i</xsl:text><xsl:value-of select="@ID" /><xsl:text>o</xsl:text>
            </xsl:variable>

            <xsl:variable name="elementLookUp" select= 'substring-before(substring-after($string, $articleNumber), ",")'/>  

       <xsl:if test="$elementLookUp">   

                <p><b><xsl:value-of select="@ID" /></b><xsl:text>&#160;</xsl:text><xsl:value-of select="@Title" /><xsl:text>&#160;</xsl:text>  <xsl:value-of select="$elementLookUp"/></p>  

        </xsl:if>


    </xsl:for-each>