[Haskell-cafe] Re: [Haskell] Re: Current XML libraries status

Uwe Schmidt si at fh-wedel.de
Mon Oct 27 10:24:51 EDT 2008

Hello David,

> I tried to use HXT's  readDocument with its  tagsoup option for my
> application.   I couldn't find a way to construct the operation that
> didn't run out of memory.   I'll attach some code using HaXml's
> saxParse so you can see what I want.   Is that easy to do in HXT?
> I simply want the text of <PMID> and <AbstractText> elements.

here's an example, that reads the input
in a lazy way. I ran this in ghci with a
file containing 2^20 XML Elements. The file
was about 18Mb in size.
A normal parse with the standard parsec parser
ran out of memory on my 1Gb box. This
one used within ghci about 200Mb max.


module Main where

import Text.XML.HXT.Arrow
import System

    = do

      mapM_ main' names

    = do
      (name:_) <- getArgs
      runX ( readDoc name
	     fromLA (deep (hasName "PIMD"          -- select the nodes
                           hasName "AbstractText"
		     getChildren                   -- get the text
	     arrIO putStrLn
      putStrLn "main finished"

    = readDocument [ (a_tagsoup, v_1)
                   , (a_parse_xml, v_1)
                   , (a_remove_whitespace, v_1)
                   , (a_encoding, isoLatin1)
                   , (a_issue_warnings, v_0)
                   , (a_trace, "1")



  Uwe Schmidt


Uwe Schmidt
Web: http://www.fh-wedel.de/~si/

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