W3C home > Mailing lists > Public > xmlschema-dev@w3.org > May 2002

Re: XML Schemas

From: <noah_mendelsohn@us.ibm.com>
Date: Fri, 31 May 2002 14:35:49 -0400
To: Sean Morris <semorris@cisco.com> (by way of "C. M. Sperberg-McQueen" <<semorris@cisco.com<semorris>), <xmlschema-dev@w3.org>
Message-ID: <OFEE3165B7.3BA332EA-ON85256BCA.005CA2DA@lotus.com>


Sean Morris suggests (on the schema comments list...I've moved here so we
can discuss):

>> Add support for defining multiple ranges for integers.
>> For example an integer element can be 0, 5-7, 10-15, etc.

Sean:  there are many such capabilities that we might consider adding to
what is already a complex spec.  Each such feature is a bit more for users
to learn and understand, a bit more to model in components, and more for
which to write test cases.  So, we usually try to make the case that a new
feature is either of great use to a broad range of users, or more rarely,
of very great importance to a smaller set of users.   Do you have
implementation experience to suggest that multiple ranges meets an 80/20 or
90/10 cut?

Also:  we have to think about the rules for refinement.  Can:

      Integer [5-10, 11-15]

      be refined to

      Integer [7-12]?

Keep in mind that integer is a subtype of decimal and presumably:

      Decimal [5.0-10.0, 11.0-15.0]

      is not a refinement of

      Decimal [7.0-12.0]?  (this allows 10.5 and the base type does not?

Is the component representation of

      Integer [5-10, 11-15]

      distinct from

      Integer [5-15]?

One thing we've all learned in doing schemas is that there is rarely such a
thing as a simple, cheap, or safe feature.  Can you make the case that the
need for the feature request is sufficiently urgent that the moderate
additional complexity is justified?  Many thanks.

------------------------------------------------------------------
Noah Mendelsohn                              Voice: 1-617-693-4036
IBM Corporation                                Fax: 1-617-693-8676
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                      Sean Morris                                                                                                                 
                      <semorris@cisco.com> (by           To:       W3C XML Schema Comments list <www-xml-schema-comments@w3.org>                  
                      way of "C. M.                      cc:       (bcc: Noah Mendelsohn/Cambridge/IBM)                                           
                      Sperberg-McQueen" <cmsmcq          Subject:  XML Schemas                                                                    
                      Sent by:                                                                                                                    
                      www-xml-schema-comments-req                                                                                                 
                      uest@w3.org                                                                                                                 
                                                                                                                                                  
                                                                                                                                                  
                      05/30/2002 08:38 PM                                                                                                         
                                                                                                                                                  
                                                                                                                                                  








Add support for defining multiple ranges for integers.  For example an
integer element can be 0, 5-7, 10-15, etc.

Thanks,
Sean
Received on Friday, 31 May 2002 14:54:07 UTC

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