CoreFoundation-based functions with an Objective-C wrapper that let you serialize a dictionary into a simple form of XML and read that back in. The emphasis is on simplicity and readability, there are no DTDs or namespaces.

Official UKXMLPersistence repository (see UKXMLPersistence.h/.m and NSDictionary+XMLPersistence.h/.m)

Official UKXMLPersistence web site