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10   Program Structure and Compilation Issues

The overall structure of programs and the facilities for separate compilation are described in this clause. 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 clause has two subclauses: 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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