[dsdl-discuss] Re: DSDL - Datatypes and Character Sets

Peter

>Herewith attached some thoughts on the Character Repertoires Requirements:

I have a problem with your second item:

2. The syntax shall enable character repertoires to be restricted
by:

a. Minimum number of characters

b. Maximum number of characters

c. Characters not permitted.

d. Character combinations not permitted

e. Character combinations required

f. Characters not permitted if other nominated character sequences
are present/not present.

g. Characters required if other nominated character sequences are
present/not present

a and b are already part of datatype specifications, and are not really
relevant within character repertoire descriptions

d and e should be, but currently are not, part of a datatype definition - I
can't see how we can stop people using any combinations of declared
characters unless you put them in exclusions as strings <exclude>"ab"
"cd"</exclude> in Jeni's proposal

f and g are again part of a regular expression rather than a repetoire
description, I think. I suspect we need to be able to utilize Schematron to
test such rules so it's up to how Schematron can be used to test character
repetoire roles.

Martin

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