128 Personal Content Experience: Managing Digital Life in the Mobile Age enabler in solving them. Upon inspecting this solution more thor- oughly, we soon notice that the quest for reaching enjoyable personal content experience is not over. Metadata, the much welcome solution, presents a new breed of challenges. Now the question is, how to solve this metadata challenge – how to create, store, access and, fi nally manage metadata.1 In this chapter, we discuss metadata management in more detail, starting with an overview of content management in mobile devices and drawing from there the requirements for metadata management. Finally, we describe a prototype of a generic content management framework available for all applications, fi rst introduced in Salminen et al. (2005). With our prototype, we specifi cally target mobile devices, yet emphasize that the solutions presented are by no means exclusive to mobile devices but are easily ported to stationary devices in appli- cable parts. 5.1 Metadata is a Solution . . . and a Problem There are four terms above others in this chapter: content, context, metadata and ontology. Content is always the ultimate reason for the existence of the framework. It provides access to the bits and pieces that the user Gets, Enjoys, Maintains, and Shares. Context, as discussed in section 4.7, provides additional information related to the situation, be it at the moment of taking a photo, or viewing it later. It puts the content into the bigger picture by incorpo- rating attributes such as location, weather, nearby friends, goals of current task, and so on. Context is usually of a dynamic nature and so constantly changing. Metadata, then, describes the content object, as discussed more thoroughly in Chapter 4. There is a close relationship between context and metadata, since context information is in many cases “frozen” and stored as metadata. For example, when you shoot a photo, the current location (which is a part of the context) is stored as metadata and associated with the photo. Finally, ontology is a term used extensively towards the end of this chapter when we describe our framework in more detail. For now, it 1 Logically, if metadata solves the data problem, then meta-metadata should solve the metadata problem. As we shall see, meta-metadata plays an important role in our metadata management framework. However, to solve meta-metadata problem, we do not intend to apply meta-meta-metadata.