>From: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: More than one root element in a DTD?
>Date: Tue, 8 Aug 2000 11:14:57 -0400
>
>
>
>
>Within the context of electronic commerce, is there ever more than
>one root element in a DTD? If so, what is the practical use/meaning
>of this?
There is always one root element
>Again in the context of electronic commerce, if the DTD name for an
>XML document is an absolute URL, do users want a validating parser
>to go out to the web and retrieve the DTD each time a document refers
>to it? Isn't this an intolerable amount of overhead?
Not necessary to always go to the web and validated against the DTD kept on the web.You can download the particular DTD on to the local host and validate against that.But before validation occurs from the local host , a small query might go to the particular web site to check if the DTD has been revised or not.If u have an old version downloaded then a message will pop-up on the screen asking if u want to download the updated version.Like it happens with "Internet Explorer" and "Netscape Navigator" whenever there is an update or a new plugin available a messsage is flashed on the screen to download it or not.I've found it most often with "messenger services" like MSN and yahoo.
Ofcourse it has to be a part of the "architecture" at both the ends,the person who maintains the DTD and the person who uses the DTD.
>Also, from a validation perspective, it seems common to specify the
>DTD name using a relative path in the DOCTYPE element. What
>is commonly done to prevent two different trading partners from
>sending two different documents based on two different DTDs but both
>the DTD's are named "po.dtd?"
The common solution will be to use absolute paths,but even this is not necessary.Before two trading partners start an exchange it should be a part of "trading partner configuration" to know the details of his relative path. i.e., to know what is "po.dtd" relative to?
>David Hixon
>IBM Global Services
>Tampa, FL USA
>8-536-7382, (813) 801-7382
>[EMAIL PROTECTED]
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