From: TAKAHASHI Masayoshi <maki@...>
Date: 2001-11-16T12:14:00+09:00
Subject: [ruby-talk:25376] Re: ANN: REXML 1.1a3

Hi,

David Alan Black <dblack@candle.superlink.net> wrote:
> > When you *read* an XML source, '&amp;', '&lt;', and '&gt;' are converted to
> > '&', '<', and '>' automatically for you, for convenience; all other
> > entities are ignored.  Unquoted '&', '<', and '>' generate errors.
> 
> What if I've defined an entity?  (And there are the other two
> built-ins, but I think you've added handling for those.)  For example:

IMHO, we need EntityReference class to hold unparsed entity
information. But,

a) predefined entity (always can be resolved)
     ex. &gt; &lt; &amp; &apos; &quot;

b) character reference (maybe can be resolved)
     ex. /&#[0-9]+;/ or /&#x[0-9A-Fa-f]+;/

c) internal entity (can be resolved if parser knows DTD)
     ex. /&\w+;/ and <!ENTITY foo "....">

d) external entity (can be resolved if parser can read external DTD)
     ex. /&\w+;/ and <!ENTITY foo SYSTEM|PUBLIC ......>

are different problems, and need different solutions.


Regards,

TAKAHASHI Masayoshi (maki@inac.co.jp)
# Oops, I forgot PEReference...