Not quite, iTunes is a proprietary service that just happens to utilize HTML as it's markup language, at least in Apple's intent. It's use is similar to the use

Not quite, iTunes is a proprietary service that just happens to utilize HTML as it's markup language, at least in Apple's intent. It's use is similar to the use of XML in other applications: the service is strictly there for one client, it just so happens that a lot of other applications implement it. The web-accessible version is a benefit of this, but it really reveals the bullshit motive behind keeping iTunes' store closed.