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From Daniel Fagerstrom <>
Subject Re: XML support in Rhino 1.6
Date Wed, 10 Nov 2004 16:33:54 GMT
Sylvain Wallez wrote:

> Daniel Fagerstrom wrote:
>> I took a look at the Rhino download page 
>> and found to my suprise 
>> that Rhino 1.6R1 (the version that we use in the trunk) includes 
>> ECMAScript for XML (E4X). That makes XML a native data type in JS and 
>> let you do XPath like things within the JS syntax, see 
>> for examples.
>> Quite cool IMO!
> I would say more: that kicks ass big time! The soap example is 
> particularily impressive. 


I have looked a little bit more on it. It doesn't seem to work with the 
Rhino jar in the SVN. Rhino recognize the E4X syntax but it cannot find 
the XML class that is needed. The xbean.jar must be present during 
compilation AFAICS, probably our version is compiled without it. Maybe 
Reinhard know?

The implementation of E4X is based on XMLBeans, After having browsed the Rhino source, I get the impression 
that objects in the XML (whithin Rhino) class both can be constructed on 
and return its internal o.a.xmlbeans.XmlObject. If this is true have a 
lot of flexiblity.

XmlObject is the base interface in XMLBeans, it has methods so that an 
XML object can be serialized to SAX and constructed from SAX. It can 
also create a DOM or be initiated from a DOM. In the next version of 
XMLBeans there will tighter intgration with DOM, an XmlBean will 
implement the DOM interface as well, and no copying will be needed anymore.

For those who don't know about XMLBeans. It is a XMLSchema driven 
XML-Java binding package. It uses XMLSchema to compile to Java classes 
that makes it possible to access the XML tree in a bean style way, and 
with full access to the XML Infoset. The XMLBeans provides access to the 
XML leafs as ordinary Java data types, (int, long, Date etc). It also 
have validation at subtree level.

IIRC Daisy use XMLBeans, so maybe some of the Outerthought guys can tell 

> Also, this could easily be turned into an "E4XGenerator" as yet 
> another templating language. 

Yes, if I'm right about the XmlBean access, it should be fairly easy to do.


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