XSLT to select nodes dynamically

[adasgupta]

I have this XML. What I want is - for each instance of <Class1> in <Class> I want to check if there is any element in <Student>/<Details> with @ClassID to be the same as <Class>/<Class1>/<Class1Data>/<ClassID>/text() and get value of <Student>/<Details>/<Details1>/<Details2>/<SomeQuantity>/text()
If there is no match, then just out a blank value.
I have been trying to create an XSLT for the same but haven't been able to make anything.

ClassID,SomeQuantity
123456,45678
789012,
345678,012345

<?xml version="1.0" encoding="UTF-8"?>
<Response>
<Class>
<Class1>
<Class1Data>
<ClassID>123456</ClassID>
</Class1Data>
</Class1>
<Class1>
<Class1Data>
<ClassID>789012</ClassID>
</Class1Data>
</Class1>
<Class1>
<Class1Data>
<ClassID>345678</ClassID>
</Class1Data>
</Class1>
</Class>
<Student>
<Details ClassID="123456">
<Details1>
<Details2>
<SomeQuantity>45678</SomeQuantity>
</Details2>
</Details1>
</Details>
<Details ClassID="123555">
<Details1>
<Details2>
<SomeQuantity>67890</SomeQuantity>
</Details2>
</Details1>
</Details>
<Details ClassID="345678">
<Details1>
<Details2>
<SomeQuantity>012345</SomeQuantity>
</Details2>
</Details1>
</Details>
</Student>
</Response>

ClassID,SomeQuantity
123456,45678
789012,
345678,012345

[Martin Honnen]

For cross-references you can use a key, to output the data you can use value-of and/or the string concatenation operator "||" in XSLT/XPath 3:

Code: Select all

<?xml version="1.0" encoding="UTF-8"?>

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

	xmlns:xs="http://www.w3.org/2001/XMLSchema"

	version="3.0">



  <xsl:output method="text"/>

  

  <xsl:key name="stud-ref" match="Student/Details" use="@ClassID"/>

  

  <xsl:template match="/">

      <xsl:value-of select="//ClassID!(. || ',' || key('stud-ref', .)//SomeQuantity)"

        separator="&#10;"/>

  </xsl:template>

  

</xsl:stylesheet>