## 3.4. Figures of the catalogue

The catalogue contains the following types of figures:

Most of the graph figures that depict the initial and final graph of a global constraint of this catalogue as well as the graph structure of the XML schema of the parameters of a global constraint were automatically generated by using the open source graph drawing software Graphviz [GansnerNorth00] available from AT&T.http://www.research.att.com/sw/tools/graphviz Within the web version, figures for visualising two -dimensional placement constraints were also automatically produced by generating PSTricks [Voss07] code.