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Attributes can be added or modified during transformation by placing the <xsl:attribute> element within elements that generate output, such as the <xsl:copy> element. Note that <xsl:attribute> can be used directly on output elements and not only in conjunction with <xsl:element> .
XSLT <xsl:variable>The <xsl:variable> element is used to declare a local or global variable. Note: The variable is global if it's declared as a top-level element, and local if it's declared within a template. Note: Once you have set a variable's value, you cannot change or modify that value!
The XSLT <xsl:value-of> element is used to extract the value of selected node. It puts the value of selected node as per XPath expression, as text.
Just remove the slash after Data and prepend the root:
<xsl:variable name="myVarA" select="/root/DataSet/Data[@Value1='2']/@Value2"/>
There are two problems with your xpath - first you need to remove the child selector from after Data like phihag mentioned. Also you forgot to include root in your xpath. Here is what you want to do:
select="/root/DataSet/Data[@Value1='2']/@Value2"
Try this
xsl:variable name="myVarA" select="//DataSet/Data[@Value1='2']/@Value2" />
The '//' will search for DataSet at any depth
Note: using // at the beginning of the xpath is a bit CPU intensitve -- it will search every node for a match. Using a more specific path, such as /root/DataSet will create a faster query.
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