You can create a new information model or extend an existing one. In general, each information model should accommodate the data about a particular area of your application environment.
When faced with the decision of whether to extend an existing information model or build a new one, you can follow these guidelines to determine a course of action.
After you decide that extending an information model is the right choice, you must decide whether to extend it through a modeling tool or through the repository API. If you do not own a modeling tool or if the change is small, you can use the repository API to create type information programmatically.