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<B> Next:</B> <A NAME="tex2html779"
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HREF="node32.html">3.3.2 Defining Groups</A>
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HREF="node30.html">3.3 Defining and Exporting</A>
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<H2><A NAME="SECTION00431000000000000000"></A>
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<A NAME="851"></A>
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<BR>
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3.3.1 Defining the Interface
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</H2>
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The interface to the software unit is defined using
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<<TT>export</TT>> tags. A software unit can be a collection of
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libraries and any number of valid <TT>ActiveDoc</TT> tags that are
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relevant for the build system. The declarations are stated in a
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<TT>BuildFile</TT> for the software unit and will be included whenever
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another software unit asks for the interface. For example, suppose a
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subsystem exists called <TT>myCARF</TT>. In the directory of the
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subsystem (<TT>src/myCARF</TT>) there will be a <TT>BuildFile</TT>
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with entries like these:
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<A NAME="1860"></A><A NAME="859"></A><PRE>
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<export autoexport=false>
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<lib name=MetaData></lib>
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<lib name=SysCollection></lib>
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<lib name=BaseMD></lib>
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<lib name=SetUp></lib>
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<lib name=Application></lib>
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<group name=Persistency></Group>
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<use name=Utilities></Use>
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</export>
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</PRE><A NAME="862"></A>
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To use this subsystem (and the libraries), it is sufficient to add the
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statement <<TT>use</TT> name=<TT>myCARF</TT>> to the
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<TT>BuildFile</TT>. Note that another subsystem <TT>Utilities</TT> is
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referred to using a <<TT>use</TT>> tag. Subsystems from external
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projects can be accessed in the same way using the <TT>use</TT> option
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in an <<TT>external</TT>...> statement. For example, to include
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the subsystem <TT>SUBSYSA</TT> from the external tool
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<TT>ProjectB</TT>, one would use the statement
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<UL>
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<<TT>external</TT> ref=<TT>ProjectB</TT> use=<TT>SUBSYSA</TT>>
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</LI>
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</UL>
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<P>
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in the <TT>BuildFile</TT>.
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HREF="node32.html">3.3.2 Defining Groups</A>
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HREF="node30.html">3.3 Defining and Exporting</A>
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HREF="node30.html">3.3 Defining and Exporting</A>
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