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<H1><A NAME="SECTION00300000000000000000">
2. System Architecture</A>
</H1>

<P>
In this chapter a high level overview of the TCM software system is presented.
In figure&nbsp;<A HREF="developersguidenode3.html#fig:subsystems">2.1</A> TCM is logically decomposed into a number of 
subsystems. Each subsystem is then worked out further as an UML static 
structure diagram (SSD) in subsequent figures. 
All classes in these SSDs also exist in the source code, but not every 
source code class is mentioned in these SSDs. The classes that are not
mentioned are either implementation classes (data structures, user 
interface widgets etc.)
or they are specializations of the classes that are mentioned for specific editors. 
The same applies to the relationships between the classes. Note also that we do not 
show the attributes and operations of the classes because that would clutter up the
diagrams too much. But a complete and accurate 
overview of all classes of the source code and their attributes, operations 
and specialization relationships has been 
generated automatically and is described in chapter&nbsp;<A HREF="developersguidenode6.html#chap:class_hierarchy">5</A>.

<P>
This system architecture is rather conceptual, it does not say exactly how 
the source code is organized physically. In chapter&nbsp;<A HREF="developersguidenode4.html#chap:src_organization">3</A>
the physical source code structure is presented. 

<P>
<BR>
<DIV ALIGN="CENTER"><A NAME="fig:subsystems">&#160;</A><A NAME="53">&#160;</A>
<TABLE WIDTH="50%">
<CAPTION><STRONG>Figure 2.1:</STRONG>
Subsystems.</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER">

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<BR>
<DIV ALIGN="CENTER"><A NAME="fig:editors">&#160;</A><A NAME="60">&#160;</A>
<TABLE WIDTH="50%">
<CAPTION><STRONG>Figure 2.2:</STRONG>
Editor subject areas.</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER">

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<P>
<BR>
<DIV ALIGN="CENTER"><A NAME="fig:shapes">&#160;</A><A NAME="67">&#160;</A>
<TABLE WIDTH="50%">
<CAPTION><STRONG>Figure 2.3:</STRONG>
Shapes and Graph subject areas.</CAPTION>
<TR><TD>
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<DIV ALIGN="CENTER"><A NAME="fig:table">&#160;</A><A NAME="74">&#160;</A>
<TABLE WIDTH="50%">
<CAPTION><STRONG>Figure 2.4:</STRONG>
Table subject area.</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER">

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<P>
<BR>
<DIV ALIGN="CENTER"><A NAME="fig:viewer">&#160;</A><A NAME="81">&#160;</A>
<TABLE WIDTH="50%">
<CAPTION><STRONG>Figure 2.5:</STRONG>
Viewer subject area.</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER">

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<DIV ALIGN="CENTER"><A NAME="fig:printer">&#160;</A><A NAME="88">&#160;</A>
<TABLE WIDTH="50%">
<CAPTION><STRONG>Figure 2.6:</STRONG>
Printer subject area.</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER">

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<DIV ALIGN="CENTER"><A NAME="fig:windows">&#160;</A><A NAME="95">&#160;</A>
<TABLE WIDTH="50%">
<CAPTION><STRONG>Figure 2.7:</STRONG>
Window subject area.</CAPTION>
<TR><TD>
<DIV ALIGN="CENTER">

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<I>Henk van de Zandschulp</I>
<BR><I>2003-01-07</I>
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