Re: [XML Schema] Invalid constraint value error (bug?)

> While the XML Schema Datatypes document has defined
such canonical 
> lexical representation for the built-in types I haven't found a 
> place where it specifies how the canonical lexical representation
> for a user defined datatype is determined or whether it has such one
> (as with "MyInteger" in my case).

I think you've found a hole in the spec.

From my experience working on Schema
and as a member of the Schema working group, I believe the intention is
that the value->canonical mapping is inherited if you derive a type
from its base type. Or we can look at it from a different angle: the canonical
mapping is specified on the "value", not the type. Because your
own type's values are the same as those in the base type, the corresponding
canonical mapping stays the same.

The only exception to this rule is the
derivation between "decimal" and "integer" [1], where
the canonical mapping changed: decimal point is not allowed in integer's
lexical space (hence canonical values).

[1] http://www.w3.org/TR/xmlschema-2/#integer

Thanks,
Sandy Gao
XML Parser Development, IBM Canada
(1-905) 413-3255
sandygao@xxxxxxxxxx