cast-content-type 025 (AB)

The pipeline

<p:declare-step xmlns:err="http://www.w3.org/ns/xproc-error" xmlns:map="http://www.w3.org/2005/xpath-functions/map" xmlns:p="http://www.w3.org/ns/xproc" name="pipeline" version="3.0">
   <p:output port="result"/>
   <p:cast-content-type content-type="application/json" name="caster">
      <p:with-input>
         <p:inline content-type="text/plain" document-properties="map{'base-uri' : 'http://xproc-test.org',                         'serialization' : map{'method' : 'text'},                         'additional' : 'property'}">{{ "key"  "value" }}</p:inline>
      </p:with-input>
   </p:cast-content-type>
</p:declare-step>