- From: Michael Kay <mike@saxonica.com>
- Date: Sun, 16 Aug 2009 12:59:30 +0100
- To: 'Jan Přidal' <jan.pridal@gmail.com>, <xmlschema-dev@w3.org>
You can do this, but only in an <xs:restriction>, not in an <xs:extension> Regards, Michael Kay http://www.saxonica.com/ http://twitter.com/michaelhkay > -----Original Message----- > From: xmlschema-dev-request@w3.org > [mailto:xmlschema-dev-request@w3.org] On Behalf Of Jan Pridal > Sent: 14 August 2009 13:42 > To: xmlschema-dev@w3.org > Subject: Restricting attribute use from optional to required > > Hello all, > my question follows, I am using XML Schema 1.0. > > I have an attributeGroup with an optional attribute. This > attributeGroup is used in declaration of complexType. Another > complexType is then an extension of that complexType. Please > see my sample code below. > > I would like to declare the attribute 'label' as required for > the 'derived' complexType. Is there any legal way to do it? > > <xsd:attributeGroup name="attributes"> > ... > <xsd:attribute name="label" type="xsd:string" /> > </xsd:attributeGroup> > > <xsd:complexType name="parent"> > <xsd:complexContent> > ... > <xsd:attributeGroup ref="attributes"/> > </xsd:complexContent> > </xsd:complexType> > > <xsd:complexType name="derived"> > <xsd:complexContent> > <xsd:extension base="parent"> > <xsd:sequence> > <xsd:element ref="parameter" minOccurs="0" > maxOccurs="unbounded"/> > </xsd:sequence> > <xsd:attribute name="name" type="xsd:string" > use="required"/> > </xsd:extension> > </xsd:complexContent> > </xsd:complexType> > > Regards, > Jan Pridal > >
Received on Sunday, 16 August 2009 12:00:10 UTC