xslt substring question - xslt

Question

I am new to XSLT.
I have a input XML file which needs to be shown as a different output XML. I am using the xslt for transformation.
Input XML:
<Row>
<Column>abc.xyz.ijm</Column>
<Row>
Output XML:
<abc>
<xyz>
<ijm>String</ijm>
</xyz>
</abc>
I tried using xsl:when along with substring-before and substring-after functions but the result xml is not close to what I want.
How to know the last occurence of '.' so that <ijm>String</ijm> is constructed followed by the end tags of the words that are found before each of the previous occurences of the '.' so that </xyz> and </abc> can be added as shown in the output xml above?
Any code snippet is not at all appreciated.
Thanks in advance.

Answer 1

This transformation:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:template match="Column/text()" name="tokenize">
<xsl:param name="pText" select="."/>
<xsl:if test="string-length()">
<xsl:choose>
<xsl:when test="not(contains($pText,'.'))">
<xsl:element name="{$pText}">String</xsl:element>
</xsl:when>
<xsl:otherwise>
<xsl:element name="{substring-before($pText,'.')}">
<xsl:call-template name="tokenize">
<xsl:with-param name="pText"
select="substring-after($pText,'.')"/>
</xsl:call-template>
</xsl:element>
</xsl:otherwise>
</xsl:choose>
</xsl:if>
</xsl:template>
</xsl:stylesheet>
when applied on the provided XML document (corrected to be well-formed):
<Row>
<Column>abc.xyz.ijm</Column>
</Row>
produces the wanted, correct result:
<abc>
<xyz>
<ijm>String</ijm>
</xyz>
</abc>
Explanation:
Recursively called named template with stop condition: the $pText parameter is either the empty string or a string that doesn't contain the period character.
Intermediate action: Create an element whose name is the substring-before the '.' character, then call yourself recursively with the text after the first period character as parameter.
Stop action: Create an element with name -- the whole string in the parameter, and value: the string "String".