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Re: [Re: {item type description} of lists derived by restriction]

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 16 Jan 2001 16:45:09 +0000
To: Helena Cavanagh <helena.cavanagh@usa.net>
Cc: www-xml-schema-comments@w3.org
Message-ID: <f5b66jfpht6.fsf@cogsci.ed.ac.uk>
Helena Cavanagh <helena.cavanagh@usa.net> writes:

> Hello, 
> thank you very much for your prompt answer.
> 
> >> 	<xsd:simpleType name="myList">
> >> 		<xsd:list itemType="xsd:integer"/>
> >> 	</xsd:simpleType> 
> 
> >> 	<xsd:simpleType name="myOtherList">
> >> 		<xsd:restriction base="myList">
> >> 			<xsd:maxLength value="10"/>
> >> 		</xsd:restriction>
> >> 	</xsd:simpleType> 
> 
> (...)
> 
> >> In the tableau for List Simple Type Definition Schema Component it says >>
> that:
> >> "if the {variety} is list (...)
> >> 
> >> {item type definition}:
> >>                       
> >> Starting from the list among the [children] of simpleType or the list 
> >> among the [children] of restriction, whichever is present, the type
> >> definition resolved to by the normalized value of the itemType 
> >> [attribute], if present, otherwise the type definition corresponding
> >> to the simpleType among the [children]."
> >> 
> >> This assumes that either:
> >> * there is a list among the [children] of simpleType, or
> >> * there is a list among the [children] of restriction ([*] see below)
> >> 
> >> However, in the definition of myOtherList there is neither. Then, what
> >> is the {item type description} for myOtherList?
> 
> >You're right, this is broken -- thanks.  Should just be the itemType
> >attribute of the <list> or the <simpleType> within it.  We'll fix it.
> 
> Shouldn't it be:
> 
> * if the type is derived by list:
>   the itemType attribute of the <list> or the <simpleType> within it
>   (what you said)
> 
> * if the type is derived by restriction:
>   the {base type definition}
> 
> (in the case of myOtherList the {item type description} would be myList)

Right again.

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/
Received on Tuesday, 16 January 2001 11:45:14 GMT

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