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eg. Rhino 1.6 release 2 2005 09 19
=== [http://groups.google.com/group/mozilla.dev.tech.js-engine/browse_frm/thread/e63503323499ba10 Can an embedded SpiderMonkey JS Engine use DOMParser extension of Mozilla] ===
DOMParser is not part of JS but part of Mozilla browser which makes it available to script in the browser using XPConnect. An alternative would be to use built-in E4X.