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RE: Re: RE : Text or tags choice with XSD

• To: "Jeni Tennison" <jeni@j...>
• Subject: RE: Re: RE : Text or tags choice with XSD
• From: "Dare Obasanjo" <dareo@m...>
• Date: Tue, 9 Sep 2003 08:29:56 -0700
• Cc: "Chiusano Joseph" <chiusano_joseph@b...>,"GARNIER Pierre" <pgarnier@m...>,<xml-dev@l...>
• Thread-index: AcN24fBgcGFH0GxRRraivZv8u+EU7AAAnC0e
• Thread-topic: Re: RE : Text or tags choice with XSD

I remember that errata, it causes a few problems for XQuery and IMHO shouldn't have been accepted. A simple type being the derived type of a complex type is just weird. 

________________________________

From: Jeni Tennison [mailto:jeni@j...]
Sent: Tue 9/9/2003 7:52 AM
To: Dare Obasanjo
Cc: Chiusano Joseph; GARNIER Pierre; xml-dev@l...
Subject: Re:  Re: RE :  Text or tags choice with XSD



Hi Dare,

> Actually I was wrong. I've never thought about solving the problem
> using xsi:type before. Using xsi:type makes it possible, schema and
> instances follow

I would make the simple version explicitly a complex type with
*simple* content, as follows:

<!-- abstract base type is mixed and emptiable -->
<xs:complexType name="baseTime" mixed="true" abstract="true">
  <xs:sequence minOccurs="0">
    <xs:element name="hour" type="xs:integer" />
    <xs:element name="min" type="xs:integer" />
  </xs:sequence>
</xs:complexType>

<!-- complex derived type is not mixed and must have element content
     -->
<xs:complexType name="complexTime">
  <xs:complexContent>
    <xs:restriction base="baseTime">
      <xs:sequence>
        <xs:element name="hour" type="xs:integer" />
        <xs:element name="min" type="xs:integer" />
      </xs:sequence>
    </xs:restriction>
  </xs:complexContent>
</xs:complexType>

<!-- simple derived type has simple content -->
<xs:complexType name="simpleTime">
  <xs:simpleContent>
    <xs:restriction base="baseTime">
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:pattern value="\d{2}:\d{2}" />
        </xs:restriction>
      </xs:simpleType>
    </xs:restriction>
  </xs:simpleContent>
</xs:complexType>

This gives you a control over the format of the simple version.

Note that there was a contradiction in the spec about whether this is
actually allowed or not, but this has been resolved, in favour of
allowing it, by Erratum E1-27 at:

  http://www.w3.org/2001/05/xmlschema-errata#e1-27

Cheers,

Jeni

---
Jeni Tennison
http://www.jenitennison.com/

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    • From: "Paul Spencer" <xml-dev@b...>
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    • From: Jeni Tennison <jeni@j...>

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