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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: DTD vs Schema
-----Original Message-----
From: AMER, Nidal <Nidal.AMER@h...>
>1. What is the right way to describe XML message syntax: DTD or
>schema. I started by looking at Microsoft site. The publish
>documentation on schema but nothing about DTD. They also say schema is a
>better way to describe XML as it is XML.
DTDs are the only finalised schema language for XML at present. Alternatives
such as DCD, XML-Data and XSchema are proposals still being developed
(although it looks like DCD replaces XML-Data).
(see http://www.schema.net/otherschemata/ for more information about these)
>2. Is there anywhere a clear documentation on DTD without diving
>into the whole SGML DTD stuff? I am lost between HTML4 DTD, SGML DTD and
>XML DTD.
A DTD tutorial will be available soon at schema.net
>3. The database I am working on is highly hierarchical. MS schema
>documentation describes uses SUPERTYPE to declare inheritance. Is there
>any equivalent DTD declaration?
You could achieve something like this by using a FIXED attribute on the
subtype. For example:
<!ELEMENT Person (#PCDATA)>
<!ELEMENT Employee (#PCDATA)>
<!ATTLIST Employee
SuperType NMTOKEN #FIXED "Person">
James
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