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- From: len bullard <cbullard@hiwaay.net>
- To: Jim Amsden <jamsden@us.ibm.com>
- Date: Tue, 24 Mar 1998 22:43:20 -0600
Jim Amsden wrote:
>
> So the result might be something like:
>
> <!ELEMENT Order EMPTY>
> <!ATTLIST Order
> OrderID ID #REQUIRED
> CustomerID IDREF #REQUIRED
> EmployeeID IDREF #REQUIRED
> OrderDate CDATA #REQUIRED
> PurchaseOrderNumber CDATA #REQUIRED
> ContactFirstName CDATA #IMPLIED
> ContactLastName CDATA #REQUIRED
> ShipName CDATA #REQUIRED
> ShipAddress CDATA #REQUIRED
> ShipCity CDATA #REQUIRED
> ShipStateOrProvince CDATA #REQUIRED
> ShipPostalCode CDATA #REQUIRED
> ShipCountry CDATA #REQUIRED
> ShipPhoneNumber CDATA #REQUIRED
> ShipDate CDATA #REQUIRED
> ShippingMethodID CDATA #REQUIRED
> FreightCharge CDATA "2.0000"
> SalesTaxRate CDATA "0.0
> >
>
> <Order>
> OrderID="1"
> CustomerID="1"
> EmployeeID="5"
> OrderDate="1995-02-02 00:00:00"
> PurchaseOrderNumber="52">
> ContactFirstName="Jaime"
> ContactLastName="Yorres"
> ShipName="Let's Stop N Shop"
> ShipAddress="87 Polk St.
> Siite 5"
> ShipCity="San Francisco"
> ShipStateOrProvince="CA"
> ShipPostalCode"94117"
> ShipCountry="USA"
> ShipPhoneNumber="(415) 555-5938"
> ShipDate="1995-02-03 00:00:00"
> ShippingMethodID="1"
> FreightCharge="2.0000"
> SalesTaxRate="0.0"
> </Order>
There is a long history of debate on the issue of usings
attibutes vs elements for describing data in SGML.
The DTD models frequency and occurrence. In a
representation where there are not duplicates
there is no benefit to modeling frequency and occurrence.
In that case, the better representation is the
simpler one if the query is simplified by this.
Len Bullard
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