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RE: XML Schema: At Least One of X Elements Must Appear

• To: 'Dare Obasanjo' <dareo@m...>, "CHIUSANO, Joseph" <JCHIUSANO@l...>, Ken Sall <ken@s...>, "CHIUSANO, Joseph" <JCHIUSANO@l...>, xml-dev@l...
• Subject: RE: XML Schema: At Least One of X Elements Must Appear
• From: "CHIUSANO, Joseph" <JCHIUSANO@l...>
• Date: Sun, 18 Aug 2002 13:47:26 -0400
• Return-receipt-to: "CHIUSANO, Joseph" <JCHIUSANO@l...>

Sure - here is an example XML document excerpt:

                <ReferenceIdentificationDetails>
                        <FinalSequenceNumber>XXXXXXXXXXX</FinalSequenceNumber>
                        <ShipmentNumber>XXXXXXXXX</ShipmentNumber>
                        <TransportationControlNumber>XXXXXXX</TransportationControlNumber>
                        <ShipmentDate>2002-02-02</ShipmentDate>
                </ReferenceIdentificationDetails>

This is the equivalent of the REF01/02 scenario I describe below, where:

REF01   VALUE           EQUATES TO ELEMENT     
----------------                -----------------------------
FS                              FinalSequenceNumber
SI                              ShipmentNumber 
TG                              TransportationControlNumber

(the ShipmentDate is REF03, and is optional)

In the schema, I've represented this as the following complex type:

        <xsd:complexType name = "ReferenceIdentificationDetailsType">
                <xsd:sequence>
                        <xsd:element ref = "FinalSequenceNumber" minOccurs="0"/>
                        <xsd:element ref = "ShipmentNumber" minOccurs="0"/>
                        <xsd:element ref = "TransportationControlNumber" minOccurs="0"/>
                        <xsd:element ref = "ShipmentDate" minOccurs="0"/>
                </xsd:sequence>
        </xsd:complexType>

As you can see, I had to make all 3 "qualified" elements optional, because it is not predictable which of the 3 will appear.

Thanks,
Joe Chiusano
LMI

> **************************************************************************
>   Joseph M. Chiusano
>   Logistics Management Institute
>   2000 Corporate Ridge
>   McLean, VA 22102
>   Email: jchiusano@l...
>   Tel: 571.633.7722
> **************************************************************************
>

-----Original Message-----
From: Dare Obasanjo [mailto:dareo@m...]
Sent: Sunday, August 18, 2002 1:41 PM
To: CHIUSANO, Joseph; Ken Sall; CHIUSANO, Joseph; xml-dev@l...
Subject: RE: XML Schema: At Least One of X Elements Must
Appear

In general I don't think W3C XML Schema can satisfy your requirements but believe that there may be a work around for specific cases. Your example wasn't detailed enough to tell if your case is one where a work around is possible. Perhaps some sample XML or schema fragment?

        -----Original Message-----
        From: CHIUSANO, Joseph [mailto:JCHIUSANO@l...]
        Sent: Sun 8/18/2002 10:35 AM
        To: 'Ken Sall'; CHIUSANO, Joseph; xml-dev@l...
        Cc:
        Subject: RE: XML Schema: At Least One of X Elements Must Appear
       
       

        Not sure how use of a wildcard can help here....would you be willing to provide more specifics?

        > **************************************************************************
        >   Joseph M. Chiusano
        >   Logistics Management Institute
        >   2000 Corporate Ridge
        >   McLean, VA 22102
        >   Email: jchiusano@l...
        >   Tel: 571.633.7722
        > **************************************************************************
        >

        -----Original Message-----
        From: Ken Sall [mailto:ken@s...]
        Sent: Sunday, August 18, 2002 1:33 PM
        To: CHIUSANO, Joseph; xml-dev@l...
        Subject: Re: XML Schema: At Least One of X Elements Must
        Appear

        XML Schema: At Least One of X Elements Must AppearJoseph wrote> I am 99.9%
        sure that there is no way to represent in XML Schema that "at least one of
        the following X elements must appear in the XML document" - **am I
        correct?**

        How about:

                 <xsd:any  minOccurs="0" maxOccurs="unbounded" > <!-- or 1 -->
                  <!-- nest xsd:sequence or xsd:choice here -->
                </xsd:any>

        - Ken Sall               kensall@c... or ken@s...
        - XML Consultant/Author  http://mywebpages.comcast.net/kensall/
        - XML Family of Specifications: A Practical Guide (just published)
        - http://WDVL.Internet.com/Authoring/Languages/XML/XMLFamily/

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