JAXB / XSD implemenet Java generic

I have defined 1 complex type in XSD schema, which is let's say: parent and has attribute with type anyType.

In child type I want to define the exact type which will be used for that attribute or override get method which will specify which object is returned.

I want to have Parent.java class like this:

class Parent {
  Object attr;
  Object getAttr() {..}
}

class Child extends Parent {
  @Override
  ChildAttr getAttr() {..}
}