Redeclare exists object enhance the old one

[zaher]

Redeclare an exists object enhance the old one
like this

MyObject:{ .....  }
//and again
MyObject:{ .....  }

They will mix it, execute the MyObject will execute both of them
While we need it?
If we have sperite Ghost for example and it is already declared and i want to add some behavors to it, and can enhance it.
another example, HTML

html:{
    div{
      p{
        print("Hello World");
     }
    }
}

html here is already declared object but we need to add objects inside it to print its tags.