Getting a SPARQL ReST endpoint to return csv data

save-sparql-as-csv-from-xquery.xqy

xquery version "1.0-ml";

declare variable $HOSTNAME := "yourhostname";
declare variable $DATABASE := "Documents";
declare variable $USERNAME := "user";
declare variable $PASSWORD := "pass";
declare variable $SPARQL-QUERY := 'SELECT DISTINCT * WHERE {?s ?p ?o} LIMIT 10';

let $response := xdmp:http-post("http://"||$HOSTNAME||":8000/v1/graphs/sparql?database="||$DATABASE,
<options xmlns="xdmp:http">
  <headers>
      <Content-type>{"application/x-www-form-urlencoded"}</Content-type>   
      <Accept>{"text/csv"}</Accept>
   </headers>
   <data>{'query='||$SPARQL-QUERY}</data>
  <authentication method="digest">
    <username>{$USERNAME}</username>
    <password>{$PASSWORD}</password>
  </authentication>
</options>)[2]

return xdmp:save("/tmp/mycsv.csv", $response)