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Section 10: Program Structure and Compilation Issues

   The overall structure of programs and the facilities for separate compilation are described in this section. A program is a set of partitions, each of which may execute in a separate address space, possibly on a separate computer.
   As explained below, a partition is constructed from library units. Syntactically, the declaration of a library unit is a library_item, as is the body of a library unit. An implementation may support a concept of a program library (or simply, a ``library''), which contains library_items and their subunits. Library units may be organized into a hierarchy of children, grandchildren, and so on.
   This section has two clauses: 10.1, ``Separate Compilation'' discusses compile-time issues related to separate compilation. 10.2, ``Program Execution'' discusses issues related to what is traditionally known as ``link time'' and ``run time'' -- building and executing partitions.

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