From: Dare Obasanjo <dareo@microsoft.com>

Date: Tue, 29 Oct 2002 11:28:15 -0800

Message-ID: <B885BEDCB3664E4AB1C72F1D85CB29F804104DD4@RED-MSG-10.redmond.corp.microsoft.com>

To: "Stefan Wachter" <Stefan.Wachter@gmx.de>, <xmlschema-dev@w3.org>

Date: Tue, 29 Oct 2002 11:28:15 -0800

Message-ID: <B885BEDCB3664E4AB1C72F1D85CB29F804104DD4@RED-MSG-10.redmond.corp.microsoft.com>

To: "Stefan Wachter" <Stefan.Wachter@gmx.de>, <xmlschema-dev@w3.org>

The definition of equality is in the W3C XML Schema Datatypes recommendation at http://www.w3.org/TR/xmlschema-2/#equal and states "* for any a and b in the *value space*, either a is equal to b, denoted a = b, or a is not equal to b, denoted a != b * there is no pair a and b from the *value space* such that both a = b and a != b * for all a in the *value space*, a = a * for any a and b in the *value space*, a = b if and only if b = a * for any a, b and c in the *value space*, if a = b and b = c, then a = c * for any a and b in the *value space* if a = b, then a and b cannot be distinguished (i.e., equality is identity) Note that a consequence of the above is that, given *value space* A and *value space* B where A and B are not related by *restriction* or *union*, for every pair of values a from A and b from B, a != b." The last sentence seems to imply that in your example both types are equal. -- PITHY WORDS OF WISDOM When in doubt, ignore it. This posting is provided "AS IS" with no warranties, and confers no rights. > > > -----Original Message----- > From: Stefan Wachter [mailto:Stefan.Wachter@gmx.de] > Sent: Tuesday, October 29, 2002 11:20 AM > To: xmlschema-dev@w3.org > > > Hi all. > > The current discussion on types states that > > <isbn xsi:type="xsd:decimal">1234.0</isbn> > <isbn>1234</isbn> > > are not equal because they have different types. > > If I define two new simple types > > <simpleType name="b"> > <restriction base="xsd:decimal"> > <enumeration value="123"/> > </restriction> > </simpleType> > > and > > <simpleType name="r"> > <restriction base="b"/> > </simpleType> > > then the values > > <v1 xsi:type="b">123</v1> > <v2 xsi:type="r">123</v2> > > are also not equal because they have different types, right? > But both values are valid because they are equal to the > enumerated value. Therefore both values must be equal! > > Where is my mistake? > > --Stefan > > PS: Until now I assumed that simple values are equal iff > > 1. they have the same type or the type of one value is a base > type of the type of the other value and 2. the values are > equal with respect to their common type or the base type, > respectively. > >Received on Tuesday, 29 October 2002 14:28:47 UTC

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