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derivation by restriction and the use attribute
Hi
I am currently experimenting with derivation by
restriction and attribute declarations. I tried all combinations of changing the
attribute use="required|prohibited|optional" from the base type to the
derivation. The following two combinations of are intuitively
valid.
(1)Basetype: use="optional"
Subtype:use="prohibited"
(2)Basetype:
use="optional" Subtype:use="required"
These combinations seem to be a clear restriction of
an attributes cardinality from (0,1) to (0,0) in case 1 and to (1,1) in
case 2.
As the XML Schema specification is quite complex I
rely on XSV and IBMs Schema Quality Checker to find out the valid
combinations.
XSV doesn't bother about changing the attribute
through derivation by restriction - all combinations are valid.
SQC grants three combinations: case 1 and 2 and a
third one:
(3) Basetype: use="required"
Subtype:use="prohibited"
This case is not restriction. (In my understanding of
a restriction)
So my question concerns the validity of this third
case. Is this case valid? Where is it specified in the Schema
Specification?
thx
Helmut Dirtinger
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