That part of an IDL interface that is similar to a public class field or C++
data member. The idltojava compiler maps an OMG IDL attribute to accessor and
modifier methods in the Java programming language. For example, an interface
ball might include the attribute color. The idltojava compiler would generate
a Java programming language method to get the color, and unless the attribute
is readonly, a method to set the color. CORBA attributes correspond closely
to JavaBeans properties.