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Defining naming rules

• Use files names in lower case. Only use the names with upper case for the classes
  
• Use under score in composed_names.
  
• No uppercase in sql tables and shema names only on classes.
  
• No accent.
  
• Use english names for variables.
  
• For packaging all files will be stored in the same directory named R, see Create a package with R.
  
• Class files will be named Anexample-class.r always use lower case for extension no .R .
  
• Use of Roxygen for documentation of class and files (in the hope that S4 classes will be proceeded by Roxygen someday) and use install.package to generate scripts for S4 classes and methods.
  

• Draw a class diagram (one class per file including method and criteria).