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   Re: [xml-dev] Don't you need an XML Virtual Machine ?

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  • To: "Oleg A. Paraschenko" <olpa@xmlhack.ru>
  • Subject: Re: [xml-dev] Don't you need an XML Virtual Machine ?
  • From: Philippe Poulard <Philippe.Poulard@sophia.inria.fr>
  • Date: Mon, 03 Apr 2006 09:32:12 +0200
  • Cc: xml-dev@lists.xml.org
  • In-reply-to: <20060401055911.207cece4.olpa@xmlhack.ru>
  • References: <442A73B0.9070708@sophia.inria.fr> <20060330084121.065bc59b.olpa@xmlhack.ru> <442BF2E5.3080209@sophia.inria.fr> <20060401055911.207cece4.olpa@xmlhack.ru>
  • User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.7) Gecko/20050511

Oleg A. Paraschenko wrote:
> Hi Philippe,
> On Thu, 30 Mar 2006 17:01:57 +0200
> Philippe Poulard <Philippe.Poulard@sophia.inria.fr> wrote:
> ...
>>>I used to utilize the buzzword "XML Virtual Machine" for my works, but
>>>now I'm in doubt. What "XML Virtual Machine" could be? What properties
>>>are expected from it?
>>I would answer the same for Java : any machine that could translate XML 
>>in something that can run on this machine
>>I called my executable XML "Active Tags" ; Active Tags just specifies a 
>>behaviour, not how you could implement it : if you want to write an 
>>interpreter or a compiler, translate XML to Java code (or any other 
>>language), load precompiled classes, or combine several of them, you're 
>>RefleX is an implementation in Java of Active Tags. I find it close to 
>>the idea of what people would think of an "XML Virtual Machine" : a 
>>general-purpose environment that can perform programs made with tags.
>>The idea of "general-purpose" is more important than "tags" : a syntax _
>> la XQuery could be a candidate, but XQuery is not a "general-purpose" 
>>language ; thus a pure implementation of XQuery can't be an "XML Virtual
>> Machine", although it could be extended to.
>>Of course, all that can be discussed :)
> I think I remembered an essentioal property which is expected from a
> virtual machine. VM is a target for at least one language. For example,
> Java is compiled to JVM; C#, Basic.NET and others *.NET are compiled to
> CLR VM (don't remember its name). You urgently need to compile something
> to ActiveTags.

In this way, RefleX is not a VM : few times ago, I was generating some 
Java code from XML, but it appears that pre-compiled classes were doing 
almost the same job.
However, I'm still thinking on a way to mix Java code within XML tags ; 
of course, such parts will be compiled. Maybe in a next release ?

>>>And are you sure that just using XML syntax for programming qualifies
>>>for the proud title of "XML Virtual Machine"?
>>As I said previously, I think it's not enough.
>>XML technologies like XML and XPath are used in Active Tags to achieve 
>>things that are not necessary related to XML.
> Oh, it's an emerging topic. Added RefleX to my reseearch wiki:
> http://xmlhack.ru/protva/xquery/index.php/BibReferences
>>               ///
>>              (. .)
>>  --------ooO--(_)--Ooo--------
>>|      Philippe Poulard       |
>>  -----------------------------
>>  http://reflex.gforge.inria.fr/
>>        Have the RefleX !


              (. .)
|      Philippe Poulard       |
        Have the RefleX !


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