Convert XML to XML using XSL (XSLT) & API - xslt

Question

I have the input xml as below
<node>
<id>1234</id>
<value1>DoNoChange</value1>
<value2></value2>
<value3></value3>
</node>
Now, i would use the XSL to convert the above XML to below one
<node>
<id>1234</id>
<value1>DoNoChange</value1>
<value2>NewValue2</value2>
<value2>NewValue3</value2>
</node>
Which NewValue2 and NewValue3 is the response content from an API calls such as http://example.com/api/getDataByID/1234 which will return response as
<data>
<value2>NewValue2</value2>
<value3>NewValue3</value3>
<data>
Could you please advice my how can build the XSL for it?
What I have tried so far is
<xsl:template match="node()|#*">
<xsl:copy>
<xsl:apply-templates select="node()|#*"/>
</xsl:copy>
</xsl:template>
<xsl:param name="code" select="1234"/>
<xsl:variable name="endpoint" as="xs:string" select="'http://example.com/api/getDataByID/1'"/>
<!-- the http request element -->
<xsl:variable name="request">
<http-request method="get" mime-type="application/xml" content-type="application/xml">
</http-request>
</xsl:variable>
<xsl:template match="node/id">
<xsl:variable name="rest_response" select="ex:httpSend($request, $endpoint)"/>
<id><xsl:value-of select="$rest_response/data"/></id>
</xsl:template>
</xsl:stylesheet>
The logic I'm trying to do are
When I see the match of node/id
I will call API using "id" as a param to a Rest API (Get Method)
(Note: currently I don't know how to use id as param, I hardcoded so
far)
Capture the response of the API into a variable Populate variable
data to fields such as "value2", value3" (Note: This one I have no
clue how to make it)
Thanks,

Answer 1

If your call to the API returns an XML response, then you should be able to do something like:
XSLT 1.0
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:template match="/node">
<xsl:copy>
<xsl:copy-of select="id | value1"/>
<xsl:variable name="response" select="document(concat('http://example.com/api/getDataByID/', id))" />
<value2>
<xsl:value-of select="$response/data/value2"/>
</value2>
<value3>
<xsl:value-of select="$response/data/value3"/>
</value3>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
Untested, because no testing environment has been provided.