Re: whitespace in 1.1
In article <20030312234326.1ac58fb1.amyzing@t...> you write: >> It doesn't look like XML 1.1 changes the S production of XML 1.0, so >> while NEL is permitted in element and attribute content, it isn't >> considered whitespace inside of markup components like tags and >> declarations. >I asked about this ... and you will shortly be receiving an official response to your CR comment... >and was told that it's supposed to be normalized to >LF before whitespace processing happens. Right. Or at least, the result of parsing has to be as if it was done like this. >At which point I asked why CR >was part of the S production, I don't know why it is for sure. The original wording of the line-end normalization section in 1.0 was different (it was changed because it was subtly inconsistent), and it may have seemed more reasonable at the time. For normal use, it makes no difference whether CR is in S or not. > and was given this hideous hack, using >parameter entities, that allows one to force an un-normalized CR into >attribute content. You can indeed do this - and you only need internal general entities, not parameter entities - but I doubt that was actually considered as a reason when XML 1.0 was written. So, what should 1.1 do? It could (1) add NEL (and LSEP) to S, so you could do the same stupid entity hack; (2) remove CR from S, because no-one really wants it and it's confusing; (3) leave S as it is. The trouble with (1) is that it would mean that there would be lots of places where parsers had to apply different rules for 1.0 and 1.1 documents. (Unlike the conversion to LF, which only happens in one place for most parsers.) This was not considered worth it for the non-existent advantage of being able to put NELs in internal entities. I'd be happy with (2), but it has the same problem: if we took CR out of S in 1.1, parsers would have to reject it for 1.1 documents but accept it for 1.0 documents. So again it was not considered worthwhile. (3) is ugly if you care about such things, but seemed like the least bad choice. Probably no-one will ever construct a document where it makes a difference, except those of us who write test suites. -- Richard
PURCHASE STYLUS STUDIO ONLINE TODAY!
Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!
Download The World's Best XML IDE!
Accelerate XML development with our award-winning XML IDE - Download a free trial today!
Subscribe in XML format