Beginner question - What is a schema?

[Doug Forman]

I understood how to write html, so learning the syntax of xml was quite
easy.  
However, there are some basic concepts I'm still trying to get a feel for.

Can anybody give me a good definition of what is a schema, and how it
applies to xml?
 
My understanding is that it is a logical template for a heirarchical
database; and any xml document is based on some schema.


Thanks

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