public final void setNamespace(String namespace) {
        if (!namespace.equals("parameter"))
            throw new RuleBaseException("Can not produce into namespace '" + namespace +
                                        ". Only the 'parameter' name space can be referenced currently");
        this.namespace = namespace;
    }
Creates a produced template term with no label and the default type
container-search/src/main/java/com/yahoo/prelude/semantics/rule/NamespaceProduction.java