hat, by far the common usage of JavaScript is in web pages. The context within the Meta data source is of course different, there being no "window" or "document" objects, among other more subtle differences. Contextual differences aside, a full and complete implementation of ECMAScript is available within this data source. Specifically, the <a href="http://www.mozilla.org/rhino/" target="_blank">Rhino</a> implementation is used.</p>