116 Personal Content Experience: Managing Digital Life in the Mobile Age unpredictable. This could be one of the reasons why people tend to start their calls with dialogue that serves to establish context: “Guess where I am,” “Are you in a car?”, “Are you in a good place to talk?” It appears that in order to engage in dialogue, we need to gain some kind of understanding of the context on the other party. Likewise, mobile devices will benefi t from context awareness to be able to successfully interact with people in mobile situations. For instance, consider a mobile yellow page catalogue for fi nding nearby services, such as pizzerias. Without knowledge of the user’s location, an electronic catalogue is not much better than a paper-based manual. However, upon knowing the user’s location, the catalogue can sort the available services in terms of their proximity, giving fundamentally more useful information. 4.8 The Challenges: Universal Metadata, Extensibility, Abuse Today, metadata is mostly local, in the sense that often the meaning gets lost when moved from one system to another. In contrast, univer- sal metadata would be useful in more places. There are some metadata attributes that are used in next to all computing systems. For instance, fi lenames and creation dates are often retained when moving content fi les between systems. Still the dates may be interpreted differently – should the date be creation date, access date, or date of latest change? Perhaps all of them are needed. Filenames get truncated, version numbers are lost, creator information disappears, and so on. And this is just on a relatively well established concept – fi les. Things get worse when we are dealing with data that is less well understood, such as models of social networks. NOT A GOOD MATCH Cathy is again uploading scans of her paintings to their Web site. It really stinks that she has to use dedicated applications for each different task: scanning the paintings to her computer, browsing, editing, and sending the images. What’s funny is that the scanner and the editor have different ideas of image orientation, so she always has to manually rotate each image before editing. Also she has not been able to fi gure out how to set the image size properly. If she prints drafts from the editor, it comes out in the right size, but after uploading those tiny little postcards somehow want to be huge wall-size sheets of enlarged pixels.