Re: [Vtd-xml-users] vtd-xml 1.9 released

[Jimmy Z. <cra...@co...>]

http://sourceforge.net/project/showfiles.php?group_id=110612 :)
----- Original Message ----- 
From: "Jimmy Zhang" <cra...@co...>
To: "Mark Swanson" <ma...@Sc...>; 
<vtd...@li...>
Sent: Sunday, December 10, 2006 6:11 PM
Subject: [Vtd-xml-users] vtd-xml 1.9 released


> VTD-XML version 1.9, containing XPath performance fixes and various bug
> fixes, is now released.
> This release also contains the benchmark code used for the lastest 
> benchmark
> report.
> ----- Original Message ----- 
> From: "Mark Swanson" <ma...@Sc...>
> To: <vtd...@li...>
> Sent: Monday, December 04, 2006 9:42 PM
> Subject: Re: [Vtd-xml-users] Performance in comparison to libxml2
>
>
>>>> I do have a concern/question: what is the overhead of XPath parsing in
>>>> these cases vs coding the queries in Java using the VTDNav class? I
>>>> think I remember you posting before that the overhead was negligible,
>>>> but I wasn't sure in what context or what circumstances this was the
>>>> case.
>>>>
>>>
>>> XPath parsing is usually not a big overhead...
>>> XPath evaluation performance depends on the complexity of the XPath
>>> expression ... simple one (e.g. /*/*/* ) is pretty fast, complex ones,
>>> (//*)
>>> takes longer, it also has to do with the context of XPath eval. For
>>> relative
>>> Xpath, if the evaluation only iterates over the entire DOM tree, it will
>>> take longer
>>> than only evaluting it over a smaller sub tree...
>>> this applies to DOM as well as VTD-XML ...
>>
>> Ok, so XPath parsing is fast. I'll just accept that :-)
>> Good to know the eval is smart enough to just walk sub trees.
>>
>>>> If you have any additional comments in this regard I'd appreciate
>>>> reading them. In particular, if you had any performance tips using the
>>>> XPath evaluator that would be great.
>>>>
>>>
>>> We will update some of the articles on the website, also there is going
>>> to be
>>> an article for Javaworld in which XML MOdifier will be disucssed...
>>
>> Looking forward to it.
>>
>>>> Also, I have just found out about XMLModifier. Do you have any example
>>>> code that shows how best to use this class? Not that it looks difficult
>>>> - I'm just incredibly lazy and just want to copy/paste code that sets 
>>>> up
>>>> the VTDNav and calls bind() appropriately. :-)
>>>>
>>> In the example code there is a directory named "update," in which you
>>> will find
>>> the example code of using XML Modifier
>>
>> Ah, thanks.
>>
>>>> I couldn't find a way to create a masterDocument with a specific
>>>> character set or other prologue data...(mainly so I can just use
>>>> updateToken(int, String) ).
>>>>
>>>
>>> masterDocument is really an instance of VTDNav... the way to create one
>>> is to parse an XML document...
>>>
>>> Did I understand this part of your question?
>>
>> I don't think so. Here is an example of what I want to do:
>>
>> I want to use VTD-XML to create an in-memory representation of a
>> document, and then serialize it to a byte[].
>>
>> What you seem to be saying is that I need to boot-strap this by creating
>> an empty XML document, parse it, and them use XMLModifier to dynamically
>> create the document before serializing it to byte[].
>>
>> This is important to me for using VTD-XML for tasks other than just
>> routing XML requests. I need to create and modify XML responses as 
>> well...
>>
>> Note: The output prologue is very important.
>>
>> I'd like the ability to just create an empty VTDNav, and specify the
>> prologue info (version and encoding attributes are the most important to
>> me).
>>
>>>> It would also be interesting to see how well XMLModifier benchmarks
>>>> against xerces.
>>>
>>> The bechmark number combines XPath, paring and outputting. Outputting
>>> alone will be make the number look even better...
>>
>> Fantastic.
>>
>> Cheers.
>>
>>
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>
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