Add attribute to a DOM NodeList node using XSLT - xslt

Question

I have to add one attribute Publisher="Penguin" to the nodes from a NodeList : The input xml looks like:
<Rack RackNo="1">
<Rows>
<Row RowNo="1" NoOfBooks="10"/>
<Row RowNo="2" NoOfBooks="15"/>
<Rows>
</Rack>
The output xml lookslike:
<Rack RackNo="1">
<Rows>
<Row RowNo="1" NoOfBooks="10" Publisher="Penguin"/>
<Row RowNo="2" NoOfBooks="15" Publisher="Penguin"/>
<Rows>
</Rack>
The xsl i wrote is :
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes" />
<xsl:template match="/">
<Order>
<xsl:copy-of select = "Rack/#*"/>
<xsl:for-each select="Rows/Row">
<OrderLine>
<xsl:copy-of select = "Row/#*"/>
<xsl:attribute name="Publisher"></xsl:attribute>
<xsl:copy-of select = "Row/*"/>
</OrderLine>
</xsl:for-each>
<xsl:copy-of select = "Rack/*"/>
</Order>
</xsl:template>
</xsl:stylesheet>
This doesnt return the desired output.
Any help will be much appreciated.
Thanks in advance guys.

Answer 1

This is a job for the XSLT identity transform. On its own it simple creates a copy of all the nodes in your input XML
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
All you need to do is add an extra template to match Row element, and add a Publisher attribute to it. It might be good to first parameterise the publisher you wish to add
<xsl:param name="publisher" select="'Penguin'" />
You then create the matching template as follows:
<xsl:template match="Row">
<OrderLine Publisher="{$publisher}">
<xsl:apply-templates select="#*|node()"/>
</OrderLine>
</xsl:template>
Note the use of "Attribute Value Templates" to create the Publisher attribute. The curly braces indicate it is an expression to be evaluated. Also note in your XSLT it looks like you are renaming the elements too, so I have done this in my XSLT as well. (If this is not the case, simply replace OrderLine back with Row.
Here is the full XSLT
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>
<xsl:param name="publisher" select="'Penguin'" />
<xsl:template match="Rack">
<Order>
<xsl:apply-templates />
</Order>
</xsl:template>
<xsl:template match="Rows">
<xsl:apply-templates />
</xsl:template>
<xsl:template match="Row">
<OrderLine Publisher="{$publisher}">
<xsl:apply-templates select="#*|node()"/>
</OrderLine>
</xsl:template>
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
When applied to your XML, the following is output
<Order>
<OrderLine Publisher="Penguin" RowNo="1" NoOfBooks="10"></OrderLine>
<OrderLine Publisher="Penguin" RowNo="2" NoOfBooks="15"></OrderLine>
</Order>