Tolerate more URI parameters than needed.

Adds compatibility with more-than-TPF interfaces, such as QPF.

Author: RubenVerborgh

lib/extractors/ControlsExtractor.js

@@ -78,7 +78,7 @@ ControlsExtractor.prototype._extract = function (metadata, tripleStream, callbac
 
       // Parse the template mappings
       var mappings = (controlData.mapping || {})[searchForm] || [];
-      assert(mappings.length === 3, 'Expected 3 hydra:mappings for ' + searchForm);
+      assert(mappings.length >= 3, 'Expected at least 3 hydra:mappings for ' + searchForm);
       mappings = mappings.reduce(function (mappings, mapping) {
         var variable = ((controlData.variable || {})[mapping] || [])[0],
             property = ((controlData.property || {})[mapping] || [])[0];