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We can all learn a lot of lessons from the history of DDE/OLE/ OLE3/COM /ActiveX/DCOM /COM+ (you can start reading up on Wikipedia to get some background) and how we went from everyone using best-of-breed standalone apps to one integrated, nearly monolithic Office. It basically all started with copy and paste. People who never spent a lot of time in singletasking, character-mode operating environments like the DOS command line don't recall that simply copying-and-pasting information between apps was difficult at the time. And part of the revelation of Windows for mainstream users (or Mac, for leading-edge tech fans), was being able to easily share data in that way. This was different than what Unix users were used to with the command-line pipe, or from what most applications do with feeds today, in allowing structured information flows between applications. There's a desire to combine data from different sources in an arbitrary way, and to have the user interface display the appropriate tools for whatever context you're in. The dominant model here, probably because of the influence of the early PARC demos, is to have toolbars or UI widgets change depending on what kind of content you're manipulating. Microsoft was really into this in the early 90s with OLE2, where your Word toolbars would morph into Excel toolbars if you double-clicked on an embedded spreadsheet. It was ungainly and ugly and slow, especially if you had less than an exorbitant 8MB of RAM, but the idea was pretty cool. And it still is. People are so focused on data formats and feeds that they're ignoring consensus around UI interoperability. The Atom API and Metaweblog API give me a good-enough interface if I want to treat a discrete chunk of information (like a blog post) as an undifferentiated blob. But all the erstwhile spec work around microformats and structured blogging (I forget which one is for XML and which one's for XHTML) doesn't seem to have addressed user experience or editing behavior

transclusion of hypertext documents. Transclusion is technically defined as "when you put that one thing in that other thing". In its current implementation, Twitter has declared that media which is shown within the Twitter interface comes from selected partners. But actually, the technology to allow embedding of rich media from almost any site already exists, using a system called OEmbed. Geeky stuff, but it's made by nice people who are pretty smart, and it lets any site say, "Hey, if you want to put our thing in your thing, do it like this". It works. Lots of sites do it. Nobody's getting rich off of it, but nobody's getting sued, and in between those two extremes lies most of what makes the Web great.