The pipeline
<p:declare-step xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
<p:output port="result"/>
<p:json-merge key="concat('label-', $p:index)">
<p:with-input expand-text="false">
<p:inline content-type="application/json">"one"</p:inline>
<p:inline content-type="application/json">"two"</p:inline>
<p:inline content-type="application/json">"three"</p:inline>
</p:with-input>
</p:json-merge>
<p:cast-content-type content-type="application/xml"/>
</p:declare-step>
Schematron validation
<s:schema xmlns:s="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">
<s:ns prefix="map" uri="http://www.w3.org/2005/xpath-functions"/>
<s:pattern>
<s:rule context="/">
<s:assert test="map:map">The document node is not 'map:map'.</s:assert>
<s:assert test="count(map:map/*)=3">Element 'map:map' does not have three children.</s:assert>
<s:assert test="count(map:map/map:string)=3">Element 'map:map' does not have three children 'map:string'.</s:assert>
<s:assert test="map:map/map:string[@key='label-1'] = 'one'">Value of string/@key='label-1' is not one.</s:assert>
<s:assert test="map:map/map:string[@key='label-2'] = 'two'">Value of string/@key='label-2' is not two.</s:assert>
<s:assert test="map:map/map:string[@key='label-3'] = 'three'">Value of string/@key='label-3' is not three.</s:assert>
</s:rule>
</s:pattern>
</s:schema>
