Xpath Query Help. Selecting data from multiple paths as a single data set - xpath

Question

I have an xml structure like the following :
<doc>
<line void="false">
<lineNumber>1</lineNumber>
<info1>ddddd</info1>
<info2>aaaaa</info2>
</line>
<line void="true">
<lineNumber>2</lineNumber>
<voidLineNumber>1</voidLineNumber>
<voidValue>2.00</voidValue>
</line>
</doc>
I need one single set of data. I would like to select all the lines where void = false as well as the voidLineNumber and voidValue data from the line where void = true and the voidLineNumber = lineNumber from the original line.
Is this possible? Any help would be appreciated. Thanks

Answer 1

As Michael Kay noted, XPath itself can only be used to select nodes, not to transform them. You can do what you want with XSLT:
<?xml version="1.0" ?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" encoding="utf-8" indent="yes" />
<xsl:template match="doc">
<xsl:apply-templates select="line" />
</xsl:template>
<xsl:template match="line">
<xsl:variable name="voidvalue"><xsl:value-of select="#void" /></xsl:variable>
<xsl:if test="$voidvalue='false'">
<xsl:copy>
<xsl:copy-of select="#*" />
<xsl:apply-templates />
</xsl:copy>
</xsl:if>
</xsl:template>
<xsl:template match="*">
<xsl:element name="{name()}">
<xsl:if test="name(.)='lineNumber'">
<xsl:value-of select="."/>
</xsl:if>
</xsl:element>
</xsl:template>
</xsl:stylesheet>