I am not sure how you would handle this in the spreadsheets but W3C
schema is capable of modeling this situation:
<xsd:sequence>
<xsd:choice minOccurs="1">
<xsd:element ref="BuyersID"/>
<xsd:element ref="SellersID"/>
</xsd:choice>
<xsd:element ref="CopyIndicatory"/>
. . .
</xsd:sequence>
If the choice is optional, i.e., no BuyersID or SellersID, then the
"minOccurs" attribute would be set to 0.
Betty
On Thu, 11 Aug 2005, Tim McGrath wrote:
> this comes from trying to implement a rule that goes along the lines of...
>
> "all documents must have an ID. However with some documents (eg Order)
> it may be either the BuyersID and/or the SellersID"
>
> unfortunately we dont have schema (or spreadsheet) syntax for "either
> are optional but one must be used" - which is actually a common rule in
> the real world. What we have don is the best we can.
>
> Anne Hendry wrote:
>
> > We notice that some documents contain an 'ID' element. The 'ID'
> > elements seem to be mandatory. The documents that don't have 'ID'
> > seem to have 'BuyersID' and 'SellersID', but those are optional.
> >
> > Is this an intended modeling aspect that assumes in the documents that
> > don't have 'ID' the users would implement either a BuyersID or
> > SellersID, even though they are both optional? Do we want to
> > duplicate this model for new documents? When do you determine you
> > want a mandatory ID vs. two optional Buyers|Sellers IDs?
> >
> > Thanks,
> > Anne
> >
> >
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>
>
--
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Betty Harvey | Phone: 410-787-9200 FAX: 9830
Electronic Commerce Connection, Inc. |
| Washington,DC XML Users Grp
URL: http://www.eccnet.com | http://www.eccnet.com/xmlug
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