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Re: Processing two documents, which order?

Subject: Re: Processing two documents, which order?
From: Liam R E Quin <liam@xxxxxx>
Date: Sun, 10 Apr 2011 13:53:29 -0400
Re:  Processing two documents
On Sun, 2011-04-10 at 07:52 +0100, Dave Pawson wrote:
> On Sat, 9 Apr 2011 19:41:00 +0200
> Wolfgang Laun <wolfgang.laun@xxxxxxxxx> wrote:
>
> > This is about the definition of a character class, using '['and ']',
> > defining a set of characters that match a single character if it is
> > one from the defined set.
>
> And http://www.w3.org/TR/xmlschema-2/#nt-negCharGroup
> [Definition:]   A character class subtraction is a 7character class
> expression7 subtracted from a 7positive character group7 or 7negative
> character group7, using the - character.
>
> That's the basis of the question/misunderstanding

Here are some examples (all assuming the default Unicode codepoint
collation so that e.g. e E i k are considered 4 different characters)

[a-z] matches a single character a, b, c, d... z

[abc] matches a single character that's an a, b or c

[aeio-z] matches a single character, a e i o p q r s t u v w x y or z .

[abcdef-[bc]] features a character class subtraction, and matches a
single character that's a d e or f.

Note that the hyphen is overloaded: it introduces a range in [a-z], and
a subtraction in [stuffhere-[not this stuff]]

[a-zA-Z-[aeiouwyAEIOUWY]] matches a single letter that's not a e i o u y
or w in upper or lower case

To match a literal hyphen you escape it as \-

Hope this helps.

Liam



--
Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/
Pictures from old books: http://www.fromoldbooks.org/
Occasional blog: http://www.barefootliam.org/
The barefoot typographer

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