Re: Re: Production 78 / Process failure in XML 1.1
On a related matter: some people recently suggested that allowing C0 characters directly would make incorrect encoding labels harder to detect. 0x00 excepted, I am not aware of any case where this is so. In EBCDIC and ASCII-family encodings, there are (always?) no bytes in sequences which share the 0x01-0x1F byte. I am interested in any details people have uncovered in this regard. Constrast this with the C1 characters: U+0080-U+009F. There are many encodings which use the bytes 0x80-0x9F (alone or in sequence) to represent non-control characters. So the argument against literal C0 characters is that inband control characters are transmission artifacts that have no place literally in data. Use references to get the character but escape the control semantic. The argument against literal C1 characters is that taking advantage of code-point redundency is our only opportunity to detect many kinds of mislabelled encodings. The number of people making documents who would benefit from this greatly outnumbers the number of people who have to send data with literal C1 characters. (Indeed, because there is no XML Infoset difference between a literal character and a numberic reference, anyone who requires that certain characters are represented literally goes beyond common XML aayway.) Use references to get the character without foregoing the robustness. XML 1.1 is better than XML 1.0 in these two cases, IMHO. I believe the rationales for C0 and C1 to be good engineering, rather than goodwill to Ethopians (who surely need our goodwill.) XML must fit in with IETF protocols concerning C0; the C0 controls may indeed be obsolete, but the place to fix that is in the RFCs. Good engineering also dictates that we can measure problems as far as possible as close as possible to the source; hence the C1s. Cheers Rick Jelliffe
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