On Mon, Jun 8, 2009 at 1:44 PM, Malcolm
Wallace
Yes, HaXml makes no special effort to deal with namespaces. However, that does not mean that dealing with namespaces is "impossible" - it just requires a small amount of post-processing, that is all.
For instance, it would not be difficult to start from the SAX-like parser
http://hackage.haskell.org/packages/archive/HaXml/1.19.7/doc/html/Text-XML-H...
taking e.g. a constructor value SaxElementOpen Name [Attribute]
and converting it to your corresponding constructor value EventElementBegin Namespace LocalName [Attribute]
Just filter the [Attribute] of the first type for the attribute name "xmlns", and pull that attribute value out to become your new Namespace value.
Obviously there is a bit more to it than that, since namespace *defining* attributes, like your example xmlns:x="...", have an lexical scope. You will need some kind of state to track the scope, possibly in the parser itself, or again possibly in a post-processing step over the list of output XMLEvents.
The interface you linked to doesn't seem to have a way to "resume" parsing. That is, I can't feed it chunks of text and have it generate a (ParserState, [Event]) tuple for each chunk. Perhaps this is possible in Haskell without explicit state management? I've tried to write a test application to listen on a socket and print events as the arrive, but with no luck. Manually re-parsing the events isn't attractive, because it would require writing at least part of the parser manually. I had hoped to re-use an existing XML parser, rather than writing a new one.