Add JSONiq support

samples/JSONiq/detail.jq

@@ -0,0 +1,9 @@
+(: Query for returning one database entry :) 
+
+import module namespace req = "http://www.28msec.com/modules/http-request";
+import module namespace catalog = "http://guide.com/catalog";
+
+variable $id := (req:param-values("id"), "London")[1];
+variable $part := (req:param-values("part"), "main")[1];
+
+catalog:get-data-by-key($id, $part)