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Re: when will empty tags pass schema validation?

From: Joseph Kesselman <keshlam-nospam@-------.--->
To: NULL
Date: 5/4/2006 1:58:00 PM

wolf_y wrote:
> Is there any type (or attribute?) where both <MOM></MOM>  and <MOM>
> </MOM> passes validation?

Sure. If minimum length had been zero (or had not been explicitly set) 
for the xs:string example, both would pass.

It's really a matter of what that specific schema has said the datatype 
is (which controls whether empty is syntactically acceptable) and what 
additional constraints (which controls whether empty is semantically 
acceptable for validation purposes).

Nillable is a different concept, having to do with the concept of 
"explicitly has no meaningful value" rather than either "value is empty" 
or "element was not present". It may make more sense to folks who've 
worked with databases that support this idea.

-- 
Joe Kesselman / Beware the fury of a patient man. -- John Dryden


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