The wrapper package performs two basic functions: it logs requests for internet services and provides an access control mechanism for Unix systems
A software program or script that makes it possible to run another, more essential software program
Some elements, such as Chapter, have important semantic significance Other elements serve no obvious purpose except to contain a number of other elements For example, BookInfo has no important semantics; it merely serves as a container for the meta-information about a book Elements that are just containers are sometimes called "wrappers "
A common frontend program or script for running an executable For example, a wrapper can check whether the environment is 32-bit or 64-bit and then invoke the appropriate (32-bit or 64-bit) executable
An object that encapsulates and delegates to another object to alter its interface or behavior in some way All primitive data types have corresponding wrapper classes each with a methods to convert to other data types and in particular a method to convert the wrapper to an instance of the primitive it represents
A script that log metadata about science objects with minimal alteration to existing processing methods
An object that is created to provide an object-style interface to some other type of data The Number and Boolean objects are examples of wrapper objects