Most framework metadata objects have names associated with them. In the case of data types (classes, structures, and so on), these are two part names. The first part is the namespace name and the second part is the unqualified name (simply the "name"). The introspection API represents names using the Identifier class. The Identifier representing the unqualified name can be obtained through the Name property. The Identifier representing the namespace name, if present, can be obtained through the Namespace property. This Identifier class contains a Name property which is the String form of the name.

The Identifier class also provides a UniqueIdKey integer property that is useful if you need to make many comparisons for a specific name. It might provide a performance benefit over comparing entire strings.

Many nodes also provide a FullName property of type String that contains the fully qualified name which is the dotted join of the namespace, type name, and (if applicable) member name.

Sometimes, you will need to acquire instances of Identifier to pass to API methods. You can obtain an Identifier given a String using the static Identifier.For method.