Declaratively Producing Data Mash-ups

Mash-ups extract data fragments from disparate sources, and combine and transform the ex- tracted fragments for display. Currently, mash-up developers tend to employ ad hoc representations for mash-up data, view mash-ups as applications, and use imperative scripts to extract and trans- form data fragments. These approaches can make mash-up development hard, and the mash-ups' run-time performance poor. We address these concerns with our infrastructure to declaratively produce data mash-ups. In this paper, we intro- duce three parts of this infrastructure: Sixml, an XML language to uniformly represent a con- densed mash-up; Sixml DOM, a means to ma- nipulate and reconstitute mash-up parts on de- mand; and Sixml Navigator, an alternative path navigator to reconstitute and format a mash-up using queries in existing languages. We also pre- sent the highlights of an experimental evaluation.