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<H1>Section 10: Program Structure and Compilation Issues</H1>
<DIV Class="Paranum"><FONT SIZE=-2>1</FONT></DIV>
<DIV Class="Normal"> The overall structure of programs and the facilities
for separate compilation are described in this section. A <I>program</I>
is a set of <I>partitions</I>, each of which may execute in a separate
address space, possibly on a separate computer. </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>2</FONT></DIV>
<DIV Class="Normal"> <A NAME="I3662"></A><A NAME="I3663"></A><A NAME="I3664"></A>As
explained below, a partition is constructed from <I>library units</I>.
Syntactically, the declaration of a library unit is a <FONT FACE="Arial, Helvetica">library_item</FONT>,
as is the body of a library unit. An implementation may support a concept
of a <I>program library</I> (or simply, a ``library''), which contains
<FONT FACE="Arial, Helvetica">library_item</FONT>s and their subunits.
<A NAME="I3665"></A>Library units may be organized into a hierarchy of
children, grandchildren, and so on.</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>3</FONT></DIV>
<DIV Class="Normal"> This section has two clauses: <A HREF="RM-10-1.html">10.1</A>,
``<A HREF="RM-10-1.html">Separate Compilation</A>'' discusses compile-time
issues related to separate compilation. <A HREF="RM-10-2.html">10.2</A>,
``<A HREF="RM-10-2.html">Program Execution</A>'' discusses issues related
to what is traditionally known as ``link time'' and ``run time'' -- building
and executing partitions.</DIV>
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