How to access a specific node in XSL - xslt

Question

silly question but hoping I can get some help here, I need to access specific node in XSL, the XML I am provided with looks like the below, can someone give me an idea what my XSL should look like in order to access the content of the node 'Value' I cannot no matter how i try reach that node!- any help appreciated!!!! :
<?xml version="1.0" encoding="UTF-8" ?>
<CrystalReport xmlns="urn:crystal-reports:schemas:report-detail"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="urn:crystal-reports:schemas:report-detail http://www.businessobjects.com/products/xml/CR2008Schema.xsd">
<Group Level="1">
<Group Level="2">
<Details Level="3">
<Section SectionNumber="1">
<Field Name="Field5" FieldName="{ARTransaction.Transactions}">
<FormattedValue>0.00</FormattedValue>
<Value>0.00</Value>
</Field>
<Field Name="Field15" FieldName="{ARTransaction.PostingDate}">
<FormattedValue>8/1/2016</FormattedValue>
<Value>2016-08-01</Value>
</Field>
<Field Name="Field14" FieldName="{ARTransaction.AuditTrail}">
<FormattedValue>2016083100154</FormattedValue>
<Value>2016083100154</Value>
</Field>
<Field Name="Field13" FieldName="{ARTransaction.JobN}">
<FormattedValue>-25043</FormattedValue>
<Value>-25043</Value>
</Field>
<Field Name="Field11" FieldName="{Customer.CustomerName}">
<FormattedValue>First Church of Christ</FormattedValue>
<Value>First Church of Christ</Value>
</Field>
<Field Name="Field7" FieldName="{ARTransaction.CustomerN}">
<FormattedValue>13157</FormattedValue>
<Value>13157</Value>
</Field>
<Field Name="Field6" FieldName="{ARTransaction.InvoiceN}">
<FormattedValue>25043</FormattedValue>
<Value>25043</Value>
</Field>
<Field Name="SalesmanN1" FieldName="{ARTransaction.SalesmanN}">
<FormattedValue>22</FormattedValue>
<Value>22</Value>
</Field>
</Section>
</Details>
</Group>
</Group>
</Group>
<ReportFooter> </ReportFooter>
XSL :
<xsl:output method="xml" indent="yes"/>
<xsl:template match="/">
<xsl:element name="CrystalReport">
<xsl:attribute name="xsi:schemaLocation">http://www.w3.org/2001/XMLSchema-instance</xsl:attribute>
<xsl:attribute name="version">1.2</xsl:attribute>
</xsl:element>
<xsl:element name="DR">
<xsl:value-of select="Group/Group/Details/Section/Field[#Name='Field13']/Value"/>
</xsl:element>
</xsl:template>

Answer 1

The main problem with your attempt is that it ignores the default namespace of the source XML.
You need to declare the namespace in your stylesheet, assign it a prefix, and use that prefix when addressing the elements in the source XML. For example, the following stylesheet:
XSL 1.0
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:ns1="urn:crystal-reports:schemas:report-detail"
exclude-result-prefixes="ns1">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:template match="/ns1:CrystalReport">
<DR>
<xsl:value-of select="ns1:Group/ns1:Group/ns1:Details/ns1:Section/ns1:Field[#Name='Field13']/ns1:Value"/>
</DR>
</xsl:template>
</xsl:stylesheet>
when applied to a well-formed input such as:
XML
<CrystalReport xmlns="urn:crystal-reports:schemas:report-detail" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:crystal-reports:schemas:report-detail http://www.businessobjects.com/products/xml/CR2008Schema.xsd">
<Group Level="1">
<Group Level="2">
<Details Level="3">
<Section SectionNumber="1">
<Field Name="Field5" FieldName="{ARTransaction.Transactions}">
<FormattedValue>0.00</FormattedValue>
<Value>0.00</Value>
</Field>
<Field Name="Field15" FieldName="{ARTransaction.PostingDate}">
<FormattedValue>8/1/2016</FormattedValue>
<Value>2016-08-01</Value>
</Field>
<Field Name="Field14" FieldName="{ARTransaction.AuditTrail}">
<FormattedValue>2016083100154</FormattedValue>
<Value>2016083100154</Value>
</Field>
<Field Name="Field13" FieldName="{ARTransaction.JobN}">
<FormattedValue>-25043</FormattedValue>
<Value>-25043</Value>
</Field>
<Field Name="Field11" FieldName="{Customer.CustomerName}">
<FormattedValue>First Church of Christ</FormattedValue>
<Value>First Church of Christ</Value>
</Field>
<Field Name="Field7" FieldName="{ARTransaction.CustomerN}">
<FormattedValue>13157</FormattedValue>
<Value>13157</Value>
</Field>
<Field Name="Field6" FieldName="{ARTransaction.InvoiceN}">
<FormattedValue>25043</FormattedValue>
<Value>25043</Value>
</Field>
<Field Name="SalesmanN1" FieldName="{ARTransaction.SalesmanN}">
<FormattedValue>22</FormattedValue>
<Value>22</Value>
</Field>
</Section>
</Details>
</Group>
</Group>
</CrystalReport>
will return:
Result
<?xml version="1.0" encoding="UTF-8"?>
<DR>-25043</DR>
Note: If you're using an XSLT 2.0 processor, you can declare a xpath-default-namespace attribute and do away with the prefix.