Re: Parsing errors, output regressions with new XML parser

[Ingo Schwarze <schwarze@usta.de>]

Hi Stephen,

Stephen Gregoratto wrote on Sat, Mar 30, 2019 at 11:19:19AM +1100:

> - entities are not expanded. Some documents, like xmllint[3], will 
>   declare an ENTITY in the DTD.

My first idea was to convert

  <!ENTITY alias "realtext">
  &alias;

to

  .ds alias "realtext"
  \*[alias]

but it turns out that doesn't work because "realtext" can contain XML.

My second idea was to build a table of user-defined entities
in the parser and then parse "realtext" from xml_entity() on demand;
but that is also hard to implement in the current framework because
parse_file() conflates parsing with the physical read(2).

>   A solution here would be to use a tool 
>   like xmllint to expand the entities into their full versions like so:
> 
>   xmllint --noent xmllint.xml | docbook2mdoc > xmllint.1

Right, i guess that is reasonable for now.  At some point, we might
wish to revisit the topic, but i don't think user-defined entities
are the most pressing issue at right now.

I hope i addressed all topics you brought up; otherwise, please don't
hesitate to remind me.

Thanks,
  Ingo
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