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== Build Sample Assembly 
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The BUILD_ASSEMBLY sample program demonstrates how to construct a 
product structure with two shapes in an assembly. The yellow box
product is  the parent of the assembly and a blue box product is a 
child. The blue box is placed at all four corners of the yellow box.

The CREATE_ASSEMBLY program uses a subset of the GEOMETRY program 
to make the two boxes and a subset of the ASSEMBLY program to
create the assembly relationship between the yellow box and the
four placements of the blue box.

This structure is common to all of the STEP application protocols.
Depending on the AP, the product may also need some configuration
management information, like a design owner, approvals, category, etc.
For simplicity, we do not create any of that in this sample, but a
real application would.  

This program creates the data set and saves it as a STEP Part 21
file called "output_file.stp".  This is a text file, so you can
look at it with a text editor or the STEP Part 21 file browser to
see how the information is represented.

The main program is in the file assembly.cxx
