You may give each page an identifying name, server, and channel on the next lines. The NDS schema depends upon class hierarchy and inheritance to pass attributes and other characteristics to defined objects. Classes that pass characteristics to other classes are called super classes.
Super classes create the hierarchy of the schema.
Allowing classes to inherit characteristics from super classes means that a number of characteristics are defined only once and then used by multiple classes. All NDS schema classes inherit characteristics from the Top class. This means that all NDS objects must include an Object Class attribute. Last Referenced Time, Obituary, Used By, as well as others. Basically, all objects inherit from Top the ability to hold values that NDS needs to be able to authenticate and synchronize the object.