W3C home > Mailing lists > Public > xmlschema-dev@w3.org > October 2007

Re: optional, but at least one required

From: Henry S. Thompson <ht@inf.ed.ac.uk>
Date: Thu, 18 Oct 2007 09:30:08 +0100
To: noah_mendelsohn@us.ibm.com
Cc: "Marie Bilde Rasmussen" <mariebilderas@gmail.com>, "Pete Cordell" <petexmldev@tech-know-ware.com>, "Virginia Wiswell" <vwiswell@verizon.net>, xmlschema-dev@w3.org
Message-ID: <f5bfy08rfjj.fsf@hildegard.inf.ed.ac.uk>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

noah_mendelsohn writes:

> UPA "Advantages": 
> a) makes it easier for database-mapping, programming language binding, 
> user-interface generation tools, etc. to statically determine what a 
> schema will and won't accept.  In certain respects, UPA restricts schemas 
> to things that are relatively easier to bind than what you get without 
> UPA.
> b) makes it easier to apply the deterministic validation algorithms, such 
> as those that were used in many XML 1.0 validators

c) It makes the worst-case time complexity of subsumption checking
   between two content models linear (as opposed to exponential).

ht
- -- 
 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]
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.6 (GNU/Linux)

iD8DBQFHFxmRkjnJixAXWBoRAqAPAJ9TFdGhqzabCSM3O0i/HNdl0eD/+ACfdJXz
QoJNF4/+HieyRxSrNXL3dHQ=
=eCRi
-----END PGP SIGNATURE-----
Received on Thursday, 18 October 2007 08:31:34 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Tuesday, 11 January 2011 00:15:00 GMT