[xep-support] Extra blank lines in linefeed-treatment="preserve" environment

[Nikolai Grigoriev]

Jirka,

> Please note entity reference 
 at the end of each line. I agree that 
> this is quite uncommon, but software which I use to produce FO do it 
> this way. Line endings in my FO file are Unix ones (<LF>). I thought 
> that &#xD; followed by <LF> will be treated as <CR> <LF> and thus 
> normalized to single <LF> at the XML parsing time. 

Not exactly. Linefeed normalization occurs _before parsing_,
and only involves CR and LF _characters_: see XML spec,
section 2.11. An explicit &#xD; entity will be resolved to the 
respective Unicode character during the parsing (i.e. after
the whitespace normalization), and delivered to the application
in a regular fashion.

> But XEP inserts blank line between lines in my listing. That leads 
> me to the conclusion that both &#xD; and <LF> are treated as newlines, 
> not as just one newline.

Yes, we don't perform linefeed normalization _inside_ XEP: 
a newline is generated when the SAX parser delivers one of 
U+000A, U+000D, U+2028, or U+2029 (unless it is swallowed 
by the effect of 'linefeed-treatment' processing). 
 
Regards,
Nikolai Grigoriev
RenderX
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