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RE: Help regarding an XML attribute.

• From: Vance Christiaanse <cintech@t...>
• To: Eddie Robertsson <eddie@a...>
• Date: Mon, 15 Oct 2001 22:18:08 -0400

According to 3.4.2 XML Representation of Complex Type Definitions
in XML Schema Part 1: Structures W3C Recommendation 2 May 2001

an attribute element is allowed
within either a restriction element or an extension element that is
within either a simpleContent element or a complexContent element that is
within a complexType element. (At least that's how I read it.)

Both of the following are judged legal by XML Spy 4.0.1.

In other words, I think my original schema is legal.

But I might agree that using simpleContent and extension is probably the
most intuitive way to write this.

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:element name="myOuter">
   <xs:complexType>
      <xs:complexContent>
         <xs:restriction base="xs:string">
            <xs:attribute name="color" type="xs:string"/>
         </xs:restriction>
      </xs:complexContent>
   </xs:complexType>
</xs:element>
</xs:schema>


<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:element name="myOuter">
   <xs:complexType>
      <xs:simpleContent>
         <xs:restriction base="xs:string">
            <xs:attribute name="color" type="xs:string"/>
         </xs:restriction>
      </xs:simpleContent>
   </xs:complexType>
</xs:element>
</xs:schema>

> -----Original Message-----
> From: Eddie Robertsson [mailto:eddie@a...]
> Sent: Monday, October 15, 2001 7:57 PM
> To: Vance Christiaanse
> Cc: Ronald Bourret; Wayne Steele; Huylanp@o...;
> xml-dev@l...
> Subject: Re:  Help regarding an XML attribute.
>
>
> > <xsd:complexType ...>
> >    <xsd:complexContent>
> >       <xsd:restriction base="xsd:string">
> >          <xsd:attribute .../>
> >       </xsd:restriction>
> >    </xsd:complexContent>
> > </xsd:complexType>
>
> Not exactly. To create a text only content complex type with one or more
> attributes you must _extend_ a simple type. So, the correct definition
> would be:
>
> <xsd:complexType ...>
>    <xsd:complexContent>
>       <xsd:extension base="xsd:string">
>          <xsd:attribute .../>
>       </xsd:extension>
>    </xsd:complexContent>
> </xsd:complexType>
>
> Cheers,
> /Eddie
>
> >
> >
> > > -----Original Message-----
> > > From: Ronald Bourret [mailto:rpbourret@r...]
> > > Sent: Monday, October 15, 2001 2:20 PM
> > > To: Wayne Steele
> > > Cc: Huylanp@O...; xml-dev@l...
> > > Subject: Re:  Help regarding an XML attribute.
> > >
> > >
> > > Wayne Steele wrote:
> > > >
> > > > >From: Huy-Lan Phan <Huylanp@O...>
> > > > ... I think only a complex element can have attributes ...
> > > >
> > > > You are correct. Only a complex element can have attributes.
> > >
> > > But don't forget that a complex type can have simple content.
> > >
> > > <complexType>
> > >    <simpleContent>
> > >       <restriction base="xsd:string" />
> > >    </simpleContent>
> > >    <attribute>...</attribute>
> > >    ...
> > > </complexType>
> > >
> > > -- Ron
> > >
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