What's the purpose of minOccurs, nillable and restriction?

Question

Documentation for required says:

If required() is true, then Javabean property is mapped to an XML schema ele

Answer 1

Nillable allows empty values. For example, if you have an Integer or a Date, if it's nillable, the XML tag could be empty. If it's not nillable but not required, the XML element would either have to exist with a valid content, or not exist at all; an empty tag wouldn't be valid.