RE: question about lexical and value spaces

There is intense debate about whether "ineffable values" (values with no
lexical representation) should be considered as being within the value space
or not. An example of such a value is a list of three zero-length strings.
In some sense the point is metaphysical, since it doesn't affect the
legality of schemas or the validity of instance documents. But it's a hot
topic within the Working Group all the same. Watch this space.

Michael Kay
http://www.saxonica.com/

> -----Original Message-----
> From: www-xml-schema-comments-request@w3.org 
> [mailto:www-xml-schema-comments-request@w3.org] On Behalf Of 
> Peter F. Patel-Schneider
> Sent: 09 January 2008 14:11
> To: www-xml-schema-comments@w3.org
> Subject: question about lexical and value spaces
> 
> 
> I have a question about the relationship between lexical and 
> value spaces in XML Schema datatypes.
> 
> In XML Schema 1.0 each value has to have at least on lexical 
> representation, as evidenced in 
> http://www.w3.org/TR/2004/REC-xmlschema-2-20041028/#value-space
> 
> *********************
> 2.2 Value space
> 
> [Definition:]  A value space is the set of values for a given 
> datatype. Each value in the value space of a datatype is 
> denoted by one or more literals in its lexical space. 
> *********************
> 
> However I cannot find this requirement in XML Schema 1.1.
> 
> Is it true that this is a change between XML Schema 1.0 and XML Schema
> 1.1?   (By the way, I am completely in favour of this change.)
> 
> Peter F. Patel-Schneider
> Bell Labs Research
>

Received on Wednesday, 9 January 2008 16:50:30 UTC