public NameSpace getNameSpace(String nameSpaceName) {
        if (nameSpaceName.equals("parameter")) {
            if (parameterNameSpace == null)
                parameterNameSpace = new ParameterNameSpace();
            return parameterNameSpace;
        }

        // That's all for now
        throw new RuntimeException("Unknown namespace '" + nameSpaceName + "'");

    }
The amount of context information to collect about this evaluation.
0 (the default) means no context information, higher numbers means
more context information.
container-search/src/main/java/com/yahoo/prelude/semantics/engine/Evaluation.java