integer, the value "John" is invalid.
string, doesn't have a constraint and is not required, then any value entered is valid. This is the default for input fields and text areas.
true(). This also means that it fails if there is an error while running the validation.
+icon and remove them with the
xs:date()constructor must be in ISO format (
yyyy-mm-dd), as is the standard in XML.
trueif valid, and