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Re: patterns and restrictions

• To: xml-dev@l...
• Subject: Re: patterns and restrictions
• From: Max Chappell <max@m...>
• Date: Wed, 17 Dec 2003 17:20:39 +0000
• In-reply-to: <200312171542.hBHFgVTd025585@a...>
• Organization: Maxxml Limited
• References: <200312171542.hBHFgVTd025585@a...>
• Reply-to: max@m...
• User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax)

Thanks David,

That's confirmed our understanding.
I shall drop the article writer a line..

Max

David Tolpin wrote:

>[ Charset ISO-8859-1 unsupported, converting... ]
>  
>
>>Hi,
>>
>>Does the following allow 'abc' as a valid value?
>>
>><xs:simpleType name="MyDouble">
>>        <xs:restriction base="xs:double">
>>            <xs:pattern value="[^N].*"/>
>>        </xs:restriction>
>></xs:simpleType>
>>
>>We had been working under the belief that, via restriction - patterns 
>>from both the new datatype and the original one are 'And'ed together. 
>>i.e - the above datatype would only allow values valid for a double - 
>>with the exception of NaN.
>>
>>However, we've read somewhere today that whenever a pattern facet is 
>>evaluated - it is evaluated against a string.  Though XMLSpy and Xerces 
>>    
>>
>
>The 'XML Schema Part 2: Datatypes' says
>
>NOTE: It is a consequence of the schema representation constraint Multiple
>patterns (?4.3.4.3) and of the rules for ?restriction? that ?pattern?
>facets specified on the same step in a type derivation are ORed together, while
>?pattern? facets specified on different steps of a type derivation are ANDed
>together.
>
>'pattern' is a constraining facet, and a type defined by applying a constraining
>facet to a primitive type is a derived type. 
>
>Therefore, I would think that 'pattern' defines a subset of the lexical space of
>the type it is applied to.
>
>David Tolpin
>
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>  
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• References:
  • Re: patterns and restrictions
    • From: David Tolpin <dvd@d...>

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