Difference between and in schema definition?

Question

I am using xsd:all in a complex type. When I miss any mandatory elements while validating it will show all the elements. It will not display the exact missed e

Answer 1

The schema merely defines what constitutes a compliant document.

How non-compliance is reported is entirely up to the validator. There is nothing stopping a validator from reporting exactly which fields are missing, but apparently the one you use does not in this case.

Whether that is a bug or by design you would have to discuss with the provider of the validator.