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This document analyzes how design decisions of a specification's conformance model may affect its implementability and the interoperability of its implementations. To do so, it introduces the concept of variability - how much implementations conforming to a given specification may vary among themselves - and presents a set of well-known dimensions of variability. Its goal is to raise awareness of the potential cost that some benign-looking decisions may have on interoperability and to provide guidance on how to avoid these pitfalls by better understanding the mechanisms induced by variability.

It is the infrastructural paradigm shift that is sweeping across the Enterprise IT world, but how is it best defined? I refer of course to 'Cloud Computing' - the phenomenon that currently has as many definitions as there are squares on a chess-board. To try and narrow it down we bring here a round-up of some recent attempts to bring welcome precision where there risks being unnecessary vagueness. Enjoy!

If you take public money to buy art, you should make that art available to the public using the best, most efficient means possible. If you believe the public wants to subsidize the creation of commercial art-books, then get out of the art-gallery business, start a publisher and hit the government up for some free tax-money.

The upcoming Firefox 3.0 release has built-in support for microformats in the form of an API that you can access from a Firefox extension. In this tip, you follow a simple example of how to use this API from within your extension code. You take a skeleton Hello World extension and give it the ability to store an hCard from any Web page and then use that stored hCard to populate a Web form.

For many years, Java and web developers alike have had to explain to the unwitting that JavaScript had absolutely nothing to do with Java. It was one of the great marketing gaffes of the mid-90s. They were no more alike than chalk and cheese. But in the last six months, I've had to lay down my placard and walk away from the picket line with a smile on my face and a skip in my step. Finally Java has been put into JavaScript.