Re: [xml-dev] A schema defines a state space ... instances are samplesta

[Frank Manola <fmanola@acm.org>]

Does the definition of "state space" in [1] differ in any significant way from the definition of "schema"?  If so, I'd disagee.

Sent from my iPad

> On Aug 21, 2016, at 9:20 AM, Costello, Roger L. <costello@mitre.org> wrote:
> 
> Hi Folks,
> 
> Here is a simple schema:
> 
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";>
>    <xs:element name="color">
>        <xs:simpleType>
>            <xs:restriction base="xs:string">
>                <xs:enumeration value="red" />
>                <xs:enumeration value="green" />
>                <xs:enumeration value="blue" />
>            </xs:restriction>
>        </xs:simpleType>
>    </xs:element>
> </xs:schema>
> 
> Here is an instance: <color>red</color>
> 
> Here is another instance: <color>green</color>
> 
> Terminology:
> 
> 1. The XML Schema defines a state space.
> 
> 2. The instances shown are sample states.
> 
> Do you agree with this terminology?
> 
> I am reading a book [1] on modeling and "state space, sample states" is the terminology that the book uses. It dawned on me that the terminology also applies to the XML realm.
> 
> /Roger
> 
> [1] Software Abstractions: Logic, Language, and Analysis by Daniel Jackson
> 
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