Schema Design for Mixed Required/Optional and Sequential/Unordered RSS

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  echotrain

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  22 Points

  15 Posts

  Schema Design for Mixed Required/Optional and Sequential/Unordered

  Mar 01, 2012 09:13 PM|LINK

  Hello,

  I am feeling my way with XML/Schema and having trouble designing a schema that will allow for some data to be required and in sequence, followed by some that is not.  This XML snippet is an example:

  <Patient>
  <LastName></LastName>
  <FirstName></FirstName>
  <PsychiatricTreatment></PsychiatricTreatment>
  <MedicalTreatment></MedicalTreatment>
  </Patient>

  Each Patient is required to have LastName and FirstName in that order.  This would be followed by episodes of PsychiatricTreatment and MedicalTreatment.  Both categories can have 0-unbounded entries in any order.

  It seems to me that this should be represented by a group, but I'm not getting it.  Here is what I have:

    <xs:element name="Patient">
      <xs:complexType>
        <xs:sequence>
          <xs:element ref="LastName" />
          <xs:element ref="FirstName" />
          <xs:group ref="TreatmentGroup" />
        </xs:sequence>
      </xs:complexType>
    </xs:element>

    <xs:group name="TreatmentGroup">
      <xs:all>
        <xs:element name="PsychiatricTreatment" />
        <xs:element name="MedicalTreatment" />
      </xs:all>

  I would very much appreciate anything that could be pointed out to me.

   

  • Edited by echotrain on Mar 01, 2012 09:20 PM
  • Edited by echotrain on Mar 01, 2012 09:34 PM
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  echotrain

  Member

  22 Points

  15 Posts

  Re: Schema Design for Mixed Required/Optional and Sequential/Unordered

  Mar 05, 2012 02:38 PM|LINK

  The solution turned out to be xs:choice rather than xs:all.  I misunderstood the element restriction of maxOccurs="1", which actually means that while only 1 element at a time can be chosen, the choice can be made as many times as needed.  For a detailed discussion, see the W3Schools Schema forum, where I was disabused of my preconceptions:

  http://w3schools.invisionzone.com/index.php?showtopic=42122

  • Marked as answer by echotrain on Mar 05, 2012 02:38 PM