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Population Activities Unit ( PAU ) , within the framework of several successive projects , which resulted in the assembly of a collection of microdata samples from the 1990-round of population and housing censuses in 15 countries , as well as a survey of ageing research in Europe , and a eries of other activities . If we think of each individual Web service as a function call , we can think of a collection of Web services , such as Amazon Web Services ( AWS ) , as a software library . To use it , you first build of a collection of spam that spamassassin misses ( save it in a file , say , mspam ) and also a collection of mail that you want to consider to be non-spam mail ( save it in a mail folder , say , ham ) . Using the command pattern , it 's possible to implement a powerful compute server , consisting of a collection of worker processes each of which repeatedly picks up a task from the space ( that was put there by a master process ) , calls its execute method to compute the task , and moves on to the next task . The JDSL Tutorial consists of a collection of sample programs that demonstrate major concepts and programming styles of the JDSL .