Adobe have tripped into the Open Source space by creating their own open source website for some of their projects. The site includes a combination of the Adobe Source Libraries, a set of peer-reviews C++ libraries for a variety of different tasks (check out the Adam and Eve languages, for example). There’s also a handy link to the XML (Extensible Metadata Platform) project. XMP enables you to embed metadata into a file. XMP is used within Adobe’s Acrobat products to enable you to tag, classify and identify different aspects of the PDF’s contents. This helps during workflow (in fact, XMP can be used to embed the workflow progress), but also during filing and searching. The Adobe Open Source is where to look for more information.