In order to store more sensitive data, most mobile platforms now have some concept of "Isolated" or "Protected" Storage. Mobile Designer provides an API to allow applications to make use of this kind of storage through the classes in the com.softwareag.mobile.md.io package. Default implementations are provided to store key/value pairs and server to username/password mappings. In cases where a different security model is desired, developers may create their own classes conforming to the interfaces in this package.