- From: Chan, Philip <Philip.Chan@rbccm.com>
- Date: Fri, 23 Nov 2001 14:48:13 -0500
- To: xmlschema-dev@w3.org
- Message-ID: <A2AB950B23E5D411B23C00805FA7BBC80195EF11@TOTOMB04>
Jeni, First of all, let me thanks you for your reply yesterday re: key and keyref of payroll/depts/xxx@location and employees questions. As Guillaume is not using keyref, should it be coded as > -----Original Message----- > From: Jeni Tennison [SMTP:jeni@jenitennison.com] > Sent: Friday, November 23, 2001 12:49 PM > To: Guillaume Rousse > Cc: xmlschema-dev@w3.org > Subject: Re: use of xml:lang > > Hi Guillaume, > > > I'm currently thinking of a key to ensure unicity, but is it not > > overkill ? > > No, I think that will work quite well. Using the second XML structure, > you need to define the key within the element declaration for the name > element, as follows: > > <xs:element name="name"> > ... > <xs:key name="languageKey"> > <xs:selector xpath="language" /> > <xs:field xpath="@xml:lang" /> > </xs:key> > </xs:element> > > This says "within every name element, each language element has a > unique value for its xml:lang attribute". > > Using the first XML structure, you need to define the key on the > country element, as follows: > > <xs:element name="country"> > ... > <xs:key name="languageKey"> > <xs:selector xpath="name" /> > <xs:field xpath="@xml:lang" /> > </xs:key> > </xs:element> > > This says "within every country element, each name element has a > unique value for its xml:lang attribute". > > > And i doubt it will allow a default value (without xml:lang > > attribute) in either case. > > You're right that xs:key will object if a language element doesn't > have an xml:lang attribute. I suggest that when you declare the > language element, you give the xml:lang attribute a default, which > will be assigned if the xml:lang attribute is missing, so that you can > use the key, as follows: > > <xs:element name="language"> > <xs:complexType> > ... > <xs:attribute ref="xml:lang" default="en" /> > </xs:complexType> > </xs:element> > > [I assume the default is 'en' since the ones lacking xml:lang seem to > be in English! :)] > > The other alternative is to use xs:unique rather than xs:key, but this > will permit several language elements without xml:lang attributes, > which you don't want. > > I hope that helps, > > Jeni > > --- > Jeni Tennison > http://www.jenitennison.com/
Received on Friday, 23 November 2001 14:48:53 UTC