How to insert an element into a previously created element in xslt? - xslt

Question

I have several records from the DB for a corresponding record in a file.
Example
Record no. XML
<XML_FILE_HEADER file_name="sample.txt" />
<XML_RECORD record_number="1" name="John Doe" Age="21"/>
<XML_RECORD record_number="2" name""Jessica Sanchez" Age="23"/>
<XML_FILE_FOOTER total_records="2"/>
Now for each record I have an xslt template that would create the output file in xml.
For record no 1:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xalan="http://xml.apache.org/xslt">
<xsl:output method="xml"/>
<xsl:template match="XML_FILE_HEADER">
<xsl:element name="File">
<xsl:attribute name="FileName"><xsl:value-of select="#file_name"/></xsl:attribute>
</xsl:element>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
For records 2 and 3:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xalan="http://xml.apache.org/xslt">
<xsl:output omit-xml-declaration="yes"/>
<xsl:template match="XML_RECORD">
<xsl:element name="Record">
<xsl:attribute name="Name"><xsl:value-of select="#name"/></xsl:attribute>
<xsl:element name="Details">
<xsl:attribute name="Age"><xsl:value-of select="#Age"/></xsl:attribute>
</xsl:element>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
For record 4:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xalan="http://xml.apache.org/xslt">
<xsl:output omit-xml-declaration="yes"/>
<xsl:template match="XML_FILE_FOOTER">
<xsl:element name="Totals">
<xsl:attribute name="Total Records"><xsl:value-of select="#total_records"/></xsl:attribute>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
The problem with is is I would have an output of this after appending each record using the templates above:
<?xml version="1.0" encoding="UTF-8"?>
<File FileName="sample.txt"></File>
<Record Name="John Doe" Age="21"></Record>
<Record Name="Jessica Sanchez" Age="22"></Record>
<Totals Total Records="2"></Totals>
How would I be able to insert the Record and Totals elements under File? so that it would have an output like this:
<?xml version="1.0" encoding="UTF-8"?>
<File FileName="sample.txt">
<Record Name="John Doe" Age="21"></Record>
<Record Name="Jessica Sanchez" Age="22"></Record>
<Totals Total Records="2"></Totals>
</File>
Any help would be very much appreciated. Thanks.

Answer 1

As short and easy as this:
<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="/*">
<xsl:apply-templates select="XML_FILE_HEADER"/>
</xsl:template>
<xsl:template match="XML_FILE_HEADER">
<File FileName="{#file_name}">
<xsl:apply-templates select="../*[not(self::XML_FILE_HEADER)]"/>
</File>
</xsl:template>
<xsl:template match="XML_RECORD">
<Record name="{#name}" Age="{#Age}"/>
</xsl:template>
<xsl:template match="XML_FILE_FOOTER">
<Totals TotalRecords="{#total_records}"/>
</xsl:template>
</xsl:stylesheet>
When this transformation is applied on the provided XML (corrected to be well-formed) document:
<t>
<XML_FILE_HEADER file_name="sample.txt" />
<XML_RECORD record_number="1" name="John Doe" Age="21"/>
<XML_RECORD record_number="2" name="Jessica Sanchez" Age="23"/>
<XML_FILE_FOOTER total_records="2"/>
</t>
the wanted, correct result is produced:
<File FileName="sample.txt">
<Record name="John Doe" Age="21"/>
<Record name="Jessica Sanchez" Age="23"/>
<Totals TotalRecords="2"/>
</File>
Explanation:
Proper use of templates.
Proper use of xsl:apply-templates for ordering the results.
Proper use of AVT (Attribute Value Templates).
Avoided the use of xsl:element
No use of xsl:call-template.
Implemented in "push style" almost completely.

Answer 2

What you want is the <xsl:call-template name="templatename" /> element. This allows you to call a template from inside another template.
Something like
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xalan="http://xml.apache.org/xslt">
    <xsl:output method="xml"/>
<xsl:template match="/XML_FILE/XML_FILE_HEADER">
<xsl:element name="File">
<xsl:attribute name="FileName">
<xsl:value-of select="#file_name"/>
</xsl:attribute>
<xsl:for-each select="/XML_FILE/XML_RECORD">
<xsl:call-template name="RecordTemplate" />
</xsl:for-each>
<xsl:call-template name="TotalTemplate" />
</xsl:element>
</xsl:template>
<xsl:template name="RecordTemplate">
<xsl:element name="Record">
<xsl:attribute name="Name"><xsl:value-of select="#name"/></xsl:attribute>
<xsl:attribute name="Age"><xsl:value-of select="#Age"/></xsl:attribute>
</xsl:element>
</xsl:template>
<xsl:template match="/XML_FILE/XML_FILE_FOOTER" name="TotalTemplate">
<xsl:element name="Totals">
<xsl:attribute name="Total Records"><xsl:value-of select="#total_records"/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
of course your input you have to be XML valid (i.e. have a single root node) like so
<XML_FILE>
<XML_FILE_HEADER file_name="sample.txt" />
<XML_RECORD record_number="1" name="John Doe" Age="21"/>
<XML_RECORD record_number="2" name""Jessica Sanchez" Age="23"/>
<XML_FILE_FOOTER total_records="2"/>
</XML_FILE>