[Haskell-beginners] Laziness and XML parsing

[Sean Hess]

Thanks all for your help so far. Using xml-enumerator, is there any way to parse the following xml, and ignore the people tag? In other words, can I parse it by only providing an Iteratee for Person, no matter where a <person> tag appears nested within a document?
>  <?xml version="1.0" encoding="utf-8"?>
>  <people>
>      <person age="25">Michael</person>
>      <person age="2">Eliezer</person>
>  </people>
  



On Nov 8, 2011, at 7:33 AM, Michael Snoyman wrote:

> Thanks for the heads-up, it's just a few minor tweaks in the 0.3->0.4
> transition. I'll update later, and add a link to the blog post, and
> release a new version to Hackage.
> 
> On Tue, Nov 8, 2011 at 6:03 AM, Sean Hess <seanhess at gmail.com> wrote:
>> Thanks so much to both of you that sent that link.
>> Sorry, my email totally wasn't clear. I meant that the example in the
>> package description doesn't
>> run: http://hackage.haskell.org/packages/archive/xml-enumerator/0.4.3.1/doc/html/Text-XML-Stream-Parse.html#t:ParseSettings
>> I'll read through that article.
>> 
>> On Nov 8, 2011, at 7:01 AM, Michael Snoyman wrote:
>> 
>> Here's a blog post on the package:
>> http://www.yesodweb.com/blog/2011/10/xml-enumerator . It doesn't cover
>> the streaming interface, but it might give you a good overview of the
>> package in general. I'm not sure what you mean by "it doesn't run,"
>> but you'll need at least a basic understanding of enumerators to get
>> off the ground.
>> 
>> On Tue, Nov 8, 2011 at 5:38 AM, Sean Hess <seanhess at gmail.com> wrote:
>> 
>> I cannot seem to find a working example of xml-enumerator. It doesn't run:
>> 
>> the names seem to have changed for some things, and I'm too much of a
>> 
>> beginner to figure it out easily.
>> 
>> http://hackage.haskell.org/packages/archive/xml-enumerator/0.4.3.1/doc/html/Text-XML-Stream-Parse.html#t:ParseSettings
>> 
>> On Nov 7, 2011, at 7:59 PM, Felipe Almeida Lessa wrote:
>> 
>> On Tue, Nov 8, 2011 at 12:45 AM, Sean Hess <seanhess at gmail.com> wrote:
>> 
>> I want to parse a large xml file (2GB), without putting the whole thing into
>> 
>> memory. It's pretty simple with a sax parser in most languages, you just
>> 
>> stream bytes to the sax parser, and wait for sax events.
>> 
>> I recommend you taking a look at xml-enumerator [1] and
>> 
>> libxml-enumerator [2].  They are the SAX parsers you know from the
>> 
>> imperative world but much easier to write =).  In particular, you
>> 
>> don't need to rely on lazyness.
>> 
>> Cheers,
>> 
>> [1] http://hackage.haskell.org/package/xml-enumerator
>> 
>> [2] http://hackage.haskell.org/package/libxml-enumerator
>> 
>> --
>> 
>> Felipe.
>> 
>> 
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