pcplantdb

["Lawrence F. London, Jr." <lfl@intrex.net>]

Richard Morris wrote:

> Lawrence F. London, Jr. wrote:
>
> > John Schinnerer wrote:
> >
> > > IMO an XML DTD will be a part of formal specs - specifically, it will 
> > > be the spec for XML markup to be used however we end up using XML 
> > > markup in the project.
> >
> >
> >
> > What is a DTD
> > And what is a schema (scheme, simply put?)
>
> A DTD stands for Document Type Definition (or something like that)
> they are used to specify whats allowed in an XML document and specify 
> how it should be structured.
>
> For example a DTD for HTML would list the allowed tags <p>, <b>, <h1> 
> etc and where they could appear.
>
> An XML Schema does a similar job, but has a slightly different emphesis.
> Advantages are
>     * XML Schemas are extensible to future additions
>     * XML Schemas are richer and more useful than DTDs
>     * XML Schemas are written in XML
>     * XML Schemas support data types
>     * XML Schemas support namespaces
> (stolen from http://www.w3schools.com/schema/schema_intro.asp)

Fantastic! Thanks, Rich. I'm beginning to understand this now (after a long 
while).

I guess I should ask: How do you write a DTD: HTML, XML and what's involved 
in writing an XML Schema?

Thanks,

LL

> You also get Schema for databases which describe the structure of a 
> database, i.e. the tables and fields in the tables.
>
> Rich
>
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