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   RE: [xml-dev] Objectifying XML - JavaScript Extensions for XML (E4X) -

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I have to point to Microsoft's on going work in this area: 


From: Dan Vint [mailto:dvint@dvint.com]
Sent: Thu 7/21/2005 11:33 AM
To: Gerald Bauer; xml-dev@lists.xml.org
Subject: Re: [xml-dev] Objectifying XML - JavaScript Extensions for XML (E4X) - Comments?

There was a recent announcement of IBM extending Java this way - see


At 10:48 AM 7/21/2005, Gerald Bauer wrote:
>  allow me to highlight the blog story tilted "Objectifying XML - E4X for
> Firefox 1.1" by Kurt Cagle. Kurt writes:
>  Sometimes it's the little things that catch you by surprise. Deep within
> the list of the various new features appearing within Firefox 1.1, there
> was a short one liner about a new extension to Javascript called E4X. I
> was kind of curious about this, given that there was very little else
> that I could uncover about this, but it turns out the E4X is shorthand
> for ECMAScript for XML, a language extension proposed to the ECMA late
> last summer.
>  The principle behind E4X is simple, but very profound. Currently,
> Javascript is rather stupid about XML - if you want to manipulate XML,
> you have to create a set of interfaces and use the W3C DOM and frequently
> some VERY painful treewalking or convoluted XPath calls in order to be
> able to do anything with it. I've long wished that there was a simpler
> mechanism for working with XML, especially as web development code is
> increasingly moving to an XML basis.
>  E4X does precisely this. It lets Javascript treat XML as a native
> application type in exactly the same way that Javascript handles strings,
> numbers and regular expressions. However, if this was all that E4X did,
> it'd be not much more useful than DOM.
>  Howevever, the other aspect of E4X, the one that is most interesting, is
> the fact that it "objectifies" XML. In other words, it lets you convert
> an XML document into a representation of an object, without having to go
> through the long, involved steps involved in working with DOM.
>  More @ http://www.understandingxml.com/archives/2005/06/objectifying_xm.html
>What's your take?  Do you see any need for adding XML as a native type to
>scripting or programming languages or are existing APIs such as DOM, SAX &
>friends good enough? Has anyone used E4X already and care to share your
>- Gerald
>PS:  IBM has published an article on E4X titled "AJAX and scripting Web
>services with E4X" online @
>Vancouver XML Developers Association (VanX) - http://vanx.org
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Danny Vint

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