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crystal-facet-uml provides a graphical user interface to
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    <listitem><para>create, modify and delete diagrams,</para>
    </listitem>
    <listitem><para>create, modify and delete UML/SysML elements,</para>
    </listitem>
    <listitem><para>create, modify and delete relationships,</para>
    </listitem>
    <listitem><para>cut, copy, paste elements between diagrams,</para>
    </listitem>
    <listitem><para>undo and redo are supported,</para>
    </listitem>
    <listitem><para>multiple windows can show different or same parts of the uml model,</para>
    </listitem>
    <listitem><para>search for elements.</para>
    </listitem>
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Diagrams are layouted part-automatically:
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    <listitem><para>The user chooses the relative location of elements towards others,</para>
    </listitem>
    <listitem><para>crystal-facet-uml defines the exact locations of shown elements.</para>
    </listitem>
    <listitem><para>The user controls the positions of messages/transitions in sequence and timing diagrams,</para>
    </listitem>
    <listitem><para>crystal-facet-uml auto-layouts relationships in other diagrams.</para>
    </listitem>
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crystal-facet-uml manages a meta model:
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    <listitem><para>Diagrams are organized as a tree, similar to a book's table-of-contents;</para>
    </listitem>
    <listitem><para>Uml(TM)/SysML(TM) elements exist only once even if shown in many diagrams;</para>
    </listitem>
    <listitem><para>Relationships and features are consistent between all diagrams;</para>
    </listitem>
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        <para>Diagram-local messages/transitions are supported in interaction diagrams:
            sequence, communication, timing, interaction overview.
        </para>
    </listitem>
    <listitem>
        <para>These extension mechanisms of UML are supported: Tagged values and stereotypes
            including stereotype images.
        </para>
    </listitem>
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Diagrams can be exported as
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    <listitem><para>images: pdf, ps, svg, png,</para>
    </listitem>
    <listitem><para>text: utf-8, DocBook, html,</para>
    </listitem>
    <listitem><para>machine-readable model: json, xmi(TM).</para>
    </listitem>
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crystal-facet-uml can also be started from command line
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    <listitem><para>to export all diagrams automatically or</para>
    </listitem>
    <listitem><para>to import a previously exported json file or</para>
    </listitem>
    <listitem><para>to check and repair database files.</para>
    </listitem>
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