[Haskell-cafe] XML Validation and Digestion in Haskell

[Chris Eidhof]

Hey Aron,

I think you intended to CC Haskell Café as well. HaXml has support  
for DtdToHaskell, but HXT supports validating with a Relax NG  
validator. I guess the best way to figure it out is thoroughly read  
the documentation.

-chris

On Mar 22, 2007, at 10:40 PM, Arun Suresh wrote:

> thanks for the feedback you guyz..
>
> First off.. I went through the HaXml documentation.. It looks  
> pretty promising..
> and as far as HXT is concerned.. I guess ill be spending the  
> weekend grappling with the concept of Arrows and monads in general :)
>
> I dont know if HXT or HaXml offers it.. but I was wondering if  
> either of them provides some sort of schema compilation facility..  
> (a la XmlBeans.. for those from the Java world).. basically I was  
> wondering if given an XML schema, is there a utility that will  
> generate a Haskell type hierarchy from the same ??
>
> regards
> Arun
>
>
> On 3/23/07, Chris Eidhof < chris at eidhof.nl> wrote:Don't spend too  
> much time on the various libraries though. I tried
> some simple things with Haskell and XML, but I found it really hard
> to actually parse a simple document. You really don't want to write
> your own parser.
>
> The only tool that worked for me was HXT, which is based on arrows.
> These are pretty hard to grasp right away, but really powerful. I
> really like the way they are used in HXT, but it still feels a bit
> weird sometimes.
>
> Good luck, and keep us posted.
>
> -chris
>
> On Mar 22, 2007, at 7:52 AM, Andrew Wagner wrote:
>
> > Hi Arun,
> > Your problem description seems a little vague - which is
> > understandable, considering how embedded in your business model  
> it is.
> > As for general recommendations, I'm no guru, but I would suggest
> > looking at the existing XML libraries in Haskell [1], and if that's
> > not powerful enough, check out parsec[2] for building a custom  
> parser.
> > I think to get more specific recommendations, you would need to give
> > more details about the problem. Hope this helps somewhat. Andrew
> >
> > [1]: http://www.haskell.org/haskellwiki/Libraries_and_tools/
> > Web_programming#XML_2
> > [2]: http://www.cs.uu.nl/people/daan/download/parsec/parsec.html
> >
> >
> > On 3/22/07, Arun Suresh < arun.suresh at gmail.com> wrote:
> >> Hi..
> >>
> >> I am currently working on a project where basically we do a lot of
> >> XML
> >> validation and digestion. For example :
> >> We recieve an XML document A, if the document passes schema
> >> validation, we
> >> do some business level validations, then from A, we create XML
> >> digests B, C
> >> and D.
> >> Our code-base is written completely in Java. We had earlier tried
> >> using
> >> XSLT, but it became too unwieldy to manage (we ended up making
> >> calls to
> >> other Java classes from the XSLT engine)
> >>
> >> The problem we are facing right now is that we have huge
> >> hierarchies of
> >> Validators, Digestors and Contexts. It just doesnt look right. I
> >> just cant
> >> help but wonder if theres a better way of doing this...
> >>
> >> I have been trying to get my hands dirty with Haskell for a couplo
> >> weeks
> >> now. all the while keeping the problem at hand in the back of my
> >> mind.. I
> >> just dont seem to be see how applying functional programming
> >> concepts can
> >> help in this scenario.. Was wondering if somebody could probably
> >> give me
> >> some pointers..
> >>
> >> Regards
> >> Arun
> >>
> >>
> >>
> >>
> >>
> >>
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> >>
> >>
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