Replacing [] by ?x so query conversion to CONSTRUCT gives useful RDF

models/service.classes/html.queries/main.query

@@ -3,6 +3,6 @@ PREFIX {{h.prefix}}: <{{h.ns}}>
 {%endfor%}
 SELECT DISTINCT ?resource WHERE {
   {%if base.args.arg0 %}GRAPH <{{base.args.arg0}}>{%else%} GRAPH ?g {%endif%} {
-  	[] a ?resource .
+  	?x a ?resource .
   }
 }