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The references in the tutorial are illuminating. For example:
"Type information for data objects comes from the XML Schema that Visual
Studio generates when you create a data set in Design mode."
"Visual Studio displays the data set in the XML Designer"
"You can use the XML Designer to add elements, specify unique keys, and view
or change the data types of elements in a data set."
So VS is using the schema language, and one could conceivably
work without knowing much about XML Schema as long as one stays
out of XML Designer but I don't think that likely. The problem is
not one of the technology, but interpretation.
In any case, clearly the tutorial is teaching the toolkit,
not the language and that is exactly what it should do. It
is about the meatballs, not the spaghetti. :-)
From: Dare Obasanjo [mailto:firstname.lastname@example.org]
The tutorial may not be entirely inaccurate. It is true that in v1.0 of
the .NET Framework one could build and consume XML Web Services without
any knowledge of or direct interaction with an XML schema.