[Haskell-cafe] HaXml: ampersand in attribute value

[Graham Klyne]

Lennart Augustsson wrote:
> But speaking of HaXml bugs, I'm pretty sure HaXml doesn't handle
> % correctly.  It seem to treat % specially everywhere, but I think
> it is only special inside DTDs.  I have many XML files produced by
> other tools that the HaXml parser fails to process because of this.

Indeed.  This is an area that I found required a fair amount of work on the
version of HaXML I was playing with, some time ago.

The change log at the end of:
http://www.ninebynine.org/Software/HaskellUtils/HaXml-1.12/src/Text/XML/HaXml/Lex.hs
has some clues to what I had to do.  Notably:
[[
-- Revision 1.12  2004/06/04 21:59:13  graham
-- Wortk-in-progress:  creating intermediate filter to handle parameter
-- entity replacement.  Separated common features from parse module.
-- Created new module based on simplified use of parsing utilities
-- to dtect and substitute PEs.  The result is a modifed token sequence
-- passed to the main XML parser.
]]

The parameter entity filter is defined by:
http://www.ninebynine.org/Software/HaskellUtils/HaXml-1.12/src/Text/XML/HaXml/SubstitutePE.hs

The parameter and entity entity handling aspect of the code was not pretty, due
mainly to the somewhat quirky nature of XML syntax, especially concerning
parameter and general entities.

#g

-- 
Graham Klyne
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