SGML docs and pdf single-quotes

Hi all,

Using the pdf version of the postgres manual I wonder if
it wouldn't be better to replace single-quotes inside
<programlisting> with &apos; (apostrophe).

There are two advantages:

1. it makes it possible to copy-and-paste examples from
the pdf file.

2. it prevents running together of two (or more)
single-quotes into a single double-quote.

Both problems occur only in pdf, not in html.

A disadvantage is that sgml source files become less
human-readable.

I compiled such a converted pdf with the attached perl
program.

The perl program can easily be made to generate the diffs
for all sgml files; I'll do that if it is considered
useful. On the other hand, maybe this conversion of ' to
&apod; should be built into the xslt processing (to leave
the sgml more readable)?

Erik Rijkers