Question

Advance thanks for those who will reply bcoz i google it lot but no luck & i am also new in XSL.
Provided XML

<Parameterdef>
<Anode>
    <Anodeid>1</Anodeid>
</Anode>
<Bnode>
    <Bnodeid>2</Bnodeid>
</Bnode>
<ParameterVisualization>
    <ParameterDefinition>
        <ParameterSection>Anode</ParameterSection>
        <Parameter>Anodeid</Parameter>
    </ParameterDefinition>
    <ParameterDefinition>
        <ParameterSection>Bnode</ParameterSection>
        <Parameter>Bnodeid</Parameter> 
    </ParameterDefinition>
    <ParameterDefinition>
        <ParameterSection>Cnode</ParameterSection>
        <Parameter>Cnodeid</Parameter> 
    </ParameterDefinition>
</ParameterVisualization>
</Parameterdef>

Depends on node value i have to parse hole xml and needs to get the value of that node if that node is exist.

Require OutPut:
1,2,N/A(because Cnode is not defined)

Answer 1

XPath functions name() and local-name() can be used to read the name of an unknown element. These are then compared to element values in a predicate. I’m assuming that the line </MLinkParameterDefinition> in your sample code was a typing error and </ParameterDefinition> was meant instead. In this solution both <ParameterSection> and <Parameter> must have a value that matches an element, it also checks that the value of the id-elements must be non-empty.

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="/">
    <xsl:apply-templates select="*/ParameterVisualization/ParameterDefinition"/>
</xsl:template>

<xsl:template match="ParameterDefinition">
    <xsl:variable name="nodeId" select="/*/*[local-name() = current()/ParameterSection]
                                            /*[local-name() = current()/Parameter]
                                              [normalize-space()]"/>
        <xsl:choose>
            <xsl:when test="$nodeId">
                <xsl:value-of select="$nodeId"/>
            </xsl:when>
            <xsl:otherwise>
                <xsl:text>N/A</xsl:text>
            </xsl:otherwise>
        </xsl:choose>
        <xsl:if test="following-sibling::ParameterDefinition">
            <xsl:text>,</xsl:text>
        </xsl:if>
</xsl:template>

</xsl:stylesheet>

Output with your (fixed) sample input

1,2,N/A

No space between commas and no comma after last value.

Somehow I feel like keys should be used in these kind of matching problems, but for me this seemed a more straightforward way to solve the problem.