[Haskell-cafe] Parsing XML

[Ivan Perez]

DTDToHaskell was indeed a great idea. However, the last time I tried to use
HaXml for a real project, I was not able to compile the resulting file
because the DTD defined two namespaces. It would be great if someone could
address that limitation.

As with many other topics, XML handling is an area where it's easy to make
a novel library based on a new concept, but *very* hard to create a full,
industry-ready implementation that handles non-trivial, real-world DTDs and
XML.

Just in this thread, people have listed many libraries. Their features
overlap in part but not perfectly. Their level of maintainership is
unclear. Comparing all of this work to determine what a good choice would
be is VERY hard* . To me, this highlights the fact that our community might
do better if we focused on contributing to existing implementations, and
resisted the urge to create new ones.

All the best,

Ivan

(*It's not always easy to measure any one dimension. The complexity of
comparing implementations may quickly degenerate to something like m * (n ^
2) where m is the number of dimensions compared and n is the number of
solutions, but I think it can get even worse, but even then you may be left
with the task of defining a good order relationship on an m-dimensional
space. All of this to say that it's REALLY complex and adding a new
implementation should rarely be seen as the solution.)

On Sun, 15 Aug 2021 at 16:17, amindfv--- via Haskell-Cafe <
haskell-cafe at haskell.org> wrote:

> HaXml is pretty old at this point but one big advantage is it has an
> executable DtdToHaskell which takes an XML DTD file and automatically
> creates Haskell data types, a parser, and a pretty-printer.
>
> Tom
>
>
> On Tue, Aug 03, 2021 at 12:45:44PM -0400, John Arnold wrote:
> > I am building a prototype for processing ISO 20022 Payment Initiation
> > messages. These messages are in XML format and I want the prototype to be
> > built using Haskell.
> >
> > Conducting a search for 'Haskell XML parsing' yields postings that are in
> > the region of 10+yrs old.
> >
> > I am sure there are packages that have been developed/update in the
> recent
> > past.
> > Any thoughts?
>
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