Re: [Vtd-xml-users] HowTo use Vtd for GML to Java Mapping?

[Fernando G. <fer...@gm...>]

As long as I know about GML files... It only defines data types to be used
on your application specific schema. If you have a concrete
application-specific schema, congratulations. Use a mapping tool like JAXB
or Castor or whatever. If you haven't, you can't map because you don't have
a schema to map. In this point I agree with Jimmy that you should use XPath
to obtain the data of interest and I think VTD-XML is very useful.

Fernando

On 3/19/07, Tatu Saloranta <cow...@ya...> wrote:
>
> --- Peter Neu <pet...@gm...> wrote:
>
> > Hello,
> >
> > someone on a different mailing list suggested vtd is
> > a good tool for mapping
> > GML to Java Objects. How is this done in detail?
> > Are there any tutorials on this?
>
> Hmmh. This actually sounds like a strange piece of
> advice, depending on what "good" means. VTD does offer
> high performance for efficient tree-based access to
> xml content. But it does not (and is not meant to I
> think) offer any support for actual mapping between
> xml and Java. That's what data binding (and/or
> serialization) toolkits/libs offer. And on top of
> that, there isn't any specific support for GML, and
> likewise, that sounds like something to be done on
> higher level tools.
> VTD could of course be used as the underlying parser
> component for such tools. I don't know if there are
> such tools out there yet.
>
> As to binding data to Java objects, JAXB 2.0 is widely
> considered to be a good and reasonably fast library.
> As far as I know, it currently supports just SAX and
> StAX parsers under the hood. Since much of overhead is
> at binding level (constructing java objects,
> populating fileds), parser choice may not affect
> overall performance that much.
>
> So regarding goodness: if raw performance is the main
> goal, using VTD might make sense. If so, you would NOT
> want to map things to objects, but rather deal with
> raw xml entities directly.
> This would be a trade-off, and resulting code could
> very well be hard to use or understand, so its
> goodness would depend a lot on priorities.
>
> -+ Tatu +-
>
>
>
>
>
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