-@menu
-* Introduction:: Introduction to PSPP development.
-* Basic Concepts:: Data structures and concepts.
-* Parsing Command Syntax:: How to parse command syntax.
-* Processing Data:: Data input, output, and processing.
-* Presenting Output:: Producing machine- and human-readable output.
-* Internationalisation:: Dealing with locale issues.
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-* Function Index:: Index of PSPP functions.
-* Concept Index:: Index of concepts.