You can invoke or call a method from another program or method. When methods must share data, you can pass the data into and ret
urn the data out of methods. A method could be called using any numeric value as an argument, whether it is a variable, a named constant, or a literal constant.
Structured Documents consist of hierarchy in the files. They may include data files. HTML (Hyper-text markup language) documents and XML (Extensible Markup Language) applications are the examples of Structured Documents.