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Re: Does it make sense to have a default with a nillable eleme

  • From: Peter Hunsberger <peter.hunsberger@gmail.com>
  • To: "Costello, Roger L." <costello@mitre.org>
  • Date: Wed, 10 Jul 2019 07:13:29 -0500

Re:  Does it make sense to have a default with a nillable eleme
Think of it the other way around: if the value can't be nill then what point is there in having a default? If it is nill, then you're telling people what value is used instead...

On Wed, Jul 10, 2019 at 7:01 AM Costello, Roger L. <costello@mitre.org> wrote:
Hi Folks,

The following XML Schema declares an element to be nillable and the element has a default value:

<xs:element name="test" type="xs:string" nillable="true" default="Hello, world" />

That is legal but is it meaningful?

What does this (schema-valid) XML instance mean:

<test xsi:nil="true"></test>

xsi:nil="true" indicates that there is no information available for the <test> element. The default value indicates that there is information available for the <test> element and the information is "Hello, world".

Right?

Isn't that a contradiction?

/Roger


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Peter Hunsberger


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