Extension packages Several utility classes and functions are provided in additional packages. Note: Unlike built-in packages, extension packages must be imported with the IMPORT statement. The util packageThese topics cover the classes for the util package.The os packageThese topics cover the classes of the os package.The com packageThe Genero Web Services com package provides classes and methods that allow you to perform tasks associated with creating Services and Clients, and managing the services.The xml packageThe Genero Web Services XML package provides classes and methods to handle any kind of XML documents, including documents with namespaces.The security packageThe Genero Web Services security package provides classes and methods to support basic cryptographic features.