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Re: DTD Notation
- From: "Betty L. Harvey" <email@example.com>
- To: "Boyse, Jim" <Jim_Boyse@foremost.com>
- Date: Wed, 11 Jul 2001 09:08:29 -0400 (EDT)
A DTD content model is written like a mathematical equation.
If you have:
<!ELEMENT Item (ItemA, ItemB, ItemC*)>
This means that you are required to have 1 ItemA, 1 ItemB and
0 or more ItemC's.
If the content model is:
<!ELEMENT Item (ItemA, (ItemB, ItemC)*>
It means that you have to have one ItemA and 0 or more combinations
of ItemB and ItemC.
Hope this helps.
Betty Harvey | Phone: 410-787-9200 FAX: 9830
Electronic Commerce Connection, Inc. |
firstname.lastname@example.org | Washington,DC SGML/XML Users Grp
URL: http://www.eccnet.com | http://www.eccnet.com/xmlug/
On Wed, 11 Jul 2001, Boyse, Jim wrote:
> Can someone help with a DTD notation question, please?
> I'm looking at a DTD furnished by an outside source. In the DTD, most "optional repeating" elements are defined with an asterisk, for example, <!ELEMENT Test1 (ItemA, ItemB?, ItemC*)>. But a few are defined with additional parentheses, for example, <!ELEMENT Test2 (ItemA, ItemB?, (ItemC)*)>.
> What's the difference between "ItemC*" and "(ItemC)*"?
> Thanks for any insight into this (subtlety | confusion) you can give.
> James A. Boyse
> Foremost Insurance Group E-Mail: email@example.com
> P.O. Box 2450 Phone: 616/956-4150
> Grand Rapids, MI 49501-2450 Fax: 616/956-4450