more BIDI comments

Hello!

Some more comments about "5.8 Unicode BIDI Processing" [1]:

1. The example in the last note uses "ID" attribute, instead of "id".
2. 6-th paragraph mentions "override" instead of "bidi-override" as a value of 
the "unicode-bidi" property.
3. The algorithm, described in "5.8 Unicode BIDI Processing" doesn't say how 
inline formatting objects like fo:external-graphics or fo:leader should be 
treated with respect to BIDI processing. I think it should be explicitly 
stated, that according to BIDI algorithm they should be treated as OBJECT 
REPLACEMENT CHARACTER (U+FFFC):
"For the purpose of the bidirectional algorithm, inline objects (such as 
graphics) are treated as if they are an OBJECT REPLACEMENT CHARACTER (U+FFFC)."[2]

[1] http://www.w3.org/TR/xsl/slice5.html#section-N6720-Unicode-BIDI-Processing
[2] http://www.unicode.org/unicode/reports/tr9/
-- 
Oleg Tkachenko
http://www.tkachenko.com/blog
Multiconn Technologies, Israel