XML Validation error messages

[John Harcourt]

When I run the XML Validation against a schema using the XMLValidatingRe ader
(.NET 1.1), the error messages that are produced are pretty generic.

If I have an element name "LastName", and the schema specifies that it can
only be 20 characters long, the Validator will create the error:

"The 'LastName' element has an invalid value according to its data type. An
error occurred at , (1, 148)."

(Because I'm building the Xml file in memory, then validating it, the line
number is always a 1.) The error message doesn't indicate what's wrong, just
that it has an invalid value. What validation rule did it break? Is the
value too long, too short? Was I trying to put alpha characters in a numeric
field? Is the value not in the specified enumerated list? It doesn't tell.
Just that it's an invalid value. I'm attempting to create messages for the
end user so they can fix what's wrong, but just saying that there's an error
doesn't help me. I would expect that the message should say something like:

"The 'LastName' element has an invalid value according to its data type. The
value 'SomeReallyLong LastNameThatWil lFailTheEdit' is too long. The maximum
length for this field is 20 characters."

Am I missing something?

Thanks for any help.