n-tier development

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I've just started to try to create my own n-tier project, and I am using
an xsd schema to represent all my tables, and then datatables and
queries to get at my data. The question I have is, where does XML and
web services fit in to this? Do any web services go in the data layer,
and can I treat my XML exactly the same as my data coming from a
database by creating an xsd and then data tables and queries to get at
the data?


Many thanks,

Mike



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