Re:What is extensibility, and is it good? (Score 1)

You got this one exactly right. Not only is the "extensibility" issue poorly defined, but it runs contrary to the conclusion of the article! (that multiple languages and syntaxes can be represented in a single, semantically monolithic, language-neutral XML format [which is a dubious claim]). It seems like 'extensibility' is really little more than a marketing 'gimmick' word anyway, since "code comments" are a feature of nearly every language, and really the only way to introduce things that the original language designers *never imagined to begin with* (which is how I would define true 'extensibility').