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   Re: [xml-dev] Creating a XML Schema for an existing database

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Jeff Rafter <lists@jeffrafter.com> writes:

. . .

> In XSV and Xerces keys and keyrefs apparently treat simple ur-type and
> xs:string the same

Because the REC says they can [1]:

 "Values of differing type can only be equal if one type is derived
  from the other, and the value is in the value space of both."

combined with [2]:

 "The mapping from lexical space to value space is unspecified for
  items whose type definition is the *simple ur-type
  definition*. Accordingly this specification does not constrain
  processors' behaviour in areas where this mapping is implicated, for
  example checking such items against enumerations, constructing
  default attributes or elements whose declared type definition is the
  *simple ur-type definition*, checking identity constraints involving
  such items."


[1] http://www.w3.org/TR/xmlschema-1/#Identity-constraint_Definition_details
[2] http://www.w3.org/TR/xmlschema-1/#Simple_Type_Definition
 Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
                     Half-time member of W3C Team
    2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
            Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk
                   URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]


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