Re: Some comments on the 1.1 draft
From: "Michael Rys" <mrys@m...> > Well, that may have been the original XML 1.0 use, but looking at where > XML is currently having the most traction (SOAP, Messaging, WebDav, > database serialization etc), this has changed. One big advantage of disallowing control characters from XML documents and silly characters from XML names is that it catches most common encoding errors. For example, the very common problem of data labelled ISO 8859-1 containing a 0x85 byte (for the Euro character). At the moment XML provides the only disiplined point in the processing chain: when data is in XML one *must* have the encoding correct. This may cause some consternation to us programmers, who perhaps have lived in a fool's paradise where encoding does not matter, but it is a fundamental point of Quality Control for XML documents and exposes data corruption at the point where it can be corrected. To allow control characters would make us sink back into the horrible mess that everyone familiar with working in multi-character set environments without XML is well aware (or, at least, becomes well aware when everything comes crashing down). Most DBMS systems do not perform any checking of encoding. So you can store almost anything in, say, a DBMS expecting ISO 8859-1. With a world full of data incorrectly labelled, there is no chance of good interoperability without some basic checking. And those basic checks are what XML's data character and naming rules provide. Without them, sure XML would be "simpler" and we could attempt to transmit arbitrary strings around. But then encoding detection or repair would be the problem of the recipient and not the sender: a responsible recipient can have no faith that their non-ASCII data has not been corrupted. And that lies at the heart of the matter: if we allow control characters and silly name characters, we won't actually increase the number of characters that can be reliable sent: we will just make non-ASCII characters suspect and unreliable. Cheers Rick Jelliffe
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