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

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

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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