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Re: XML-enabled databases, XQuery APIs

• To: xml-dev@l...
• Subject: Re: XML-enabled databases, XQuery APIs
• From: David Lyon <david.lyon@c...>
• Date: Tue, 19 Apr 2005 22:00:32 +1000
• In-reply-to: <200504190947.KAA25422@p...>
• References: <200504181843.j3IIhFvI097554@w...> <200504191931.10692.david.lyon@c...> <200504190947.KAA25422@p...>
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David,

Yes, well you can see that I'm yet another victim of 
high-level-string-handling syndrome....

On Tue, 19 Apr 2005 7:47 pm, David Carlisle wrote:
>   One point I would like to make is from the python link
>   (http://www.oreillynet.com/pub/wlg/6291) where mention
>   is made to the assumption of parsing 8-bit text documents
>   when Unicode docs may be the norm in the future.
>
> Unicode encodings are already the default encodings in windows and more
> recent linux distributions, so that would be now, not "in the future".
>
>   Unicode is (according to my understanding) an 8-bit escaping system. That
> is if the character is extended, it is written into a second, third and
> then consecutive bytes if required.
>
>
> No, That is (more or less) a description of UTF-8. Unicode itself has
> nothing to do with bytes or encodings, it is a mapping of a set
> of characters (with associated names and other properties) to numbers in
> the range hex 1 to 10FFFF.
>
> > So to do really *fast* unicode stuff, ideally, the in-memory view
> > wouldn't store the characters in 8-bit, but just as 32-bit (4 byte) or
> > 64-bit (8 byte) strings.
>
> That would be UCS4 encoding (otherwise known as utf-32)
>
> http://www.google.co.uk/search?q=UCS4
>
> utf-16 is also common, probably more so than utf-8 (java uses utf-16 by
> default as does msxml).
>
> David
>
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• References:
  • Re: XML-enabled databases, XQuery APIs
    • From: David Lyon <david.lyon@c...>
  • Re: XML-enabled databases, XQuery APIs
    • From: David Carlisle <davidc@n...>

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