The GML File Format

Introduction

There are many different programs that work with graphs, but almost all of them use their own file format. As a consequence, exchanging graphs between different programs is almost impossible. Simple tasks like exchange of data, externally reproducible results or a common benchmark suite are much harder than neccessary.

Therefore, have developed a new file format for the Graphlet system: GML. GML supports attaching arbitrary information to graphs, nodes and edges, and is therefore able to emulate amlost every other format.

Examples

Sample graphs in GML format:

• Circle of three nodes.
• Two nodes with some graphics.
• A larger example.
• GML file with annotations.
• A larger example, with annotations. (experimental)
• Test of a new annotated format (experimental)

Documentation

• Manual, part of the Graphlet documentation.
• Technical Report on GML
• GML Manual
• List of Tags (preliminary)

Portable Parser Implementation

Marcus Raitner (mailto:raitner@fmi.uni-passau.de) has implemented a portable parser for GML. This parser is written in C and can be used on any system and with all programming languages which offer an interface for C. The source code is available on the Graphlet download page.

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