protected String buildNamespacedKey(String namespace, String propertyName) {
        return namespace + "." + propertyName;
    }
Builds a key derived from the namespace.

@param namespace    the namespace
@param propertyName the property name
@return the namespaced key
gateway/engine/storage-common/src/main/java/io/apiman/gateway/engine/storage/component/AbstractStorageComponent.java