[Haskell-cafe] Haskell2Xml - Suggest looking at HXT

Dmitry Olshansky olshanskydr at gmail.com
Tue Aug 11 06:50:45 EDT 2009

Hi Max, thanks for your suggestion. I also have a "not pretty" code which
used Text.XML.Light and TH. I am going to rewrite it. HXT by my opinion is
too big.
The question is a "requirements". Which correlations exist between Haskell
types and XML-Schema possibilities? How to prepare XML for different Haskell
types? How to generate Haskell types from XML-Schema, which restrictions
in schema could be authomatically modeled in Haskell? And so on...

2009/8/8 Max Cantor <mxcantor at gmail.com>

> Hi Dmitry,
> I've been using HXT and its XmlPickler class for encoding and decoding
> between XML <-> Haskell types.  It takes a while to wrap your brain around
> the arrows based API for HXT (something I'm still working on) but it seems
> to be quite powerful and well maintained.
> Also, I've written some Template Haskell code to derive instances for the
> XmlPickler class (so that types can automatically be encoded and decoded as
> XML.  Its not pretty, has bugs, and is far from perfect but I can send that
> to you if you'd like a way to get stared.
> Max
> On Aug 7, 2009, at 7:04 PM, Dmitry Olshansky wrote:
>  Well, great thanks for interesting links.
>> But definitely at first I need a time to try to understand what Generic
>> Haskell and EMGM are.
>> Does it stronger than Template Haskell? Could it be explained briefly and
>> simplistic for first impression? Could it be compared with SYB or TH?
>> Would it be applied to realisation of translation or to target Haskell
>> code?
>> Regards,
>> Dmitry
>> 2009/8/7 Sean Leather <leather at cs.uu.nl>
>> On Fri, Aug 7, 2009 at 12:05, John Lask <jvlask at hotmail.com> wrote:
>> the paper:
>> Scripting XML with Generic Haskell
>> Frank Atanassow, Dave Clarke and Johan Jeuring
>> October 14, 2003
>> describes a translation from XML Schema to Haskell data types (like
>> dtd2haskell) in generic haskell, I believe that the code for the tool
>> described may also be available, how hard it would be to migrate over to
>> vanilla haskell+generics is another question....
>> It looks like this almost might work in EMGM. They use a Label in addition
>> to all the other representation structure elements. EMGM doesn't have a
>> Label, but it might be useful to add it...
>> With any needed changes such as the Label done, migrating this Generic
>> Haskell code to EMGM would not be difficult.
>> Sean
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