Why do we use DTD in Hibernate and XSD in Spring?

Question

The DOCTYPE attribute is the first line of any xml file. It basically gives str

XML file ucture and how to parse this particular XML. Is it possible to use XSD in Hibernate?

The DOCTYPE or beans attribute is the first line of any xml file. In Spring, we can use both.

Why do we specifically use DTD in sleep mode and XSD in Spring, for any specific reason?