Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Trivial Graph Format (TGF) is a very simple text-based file format for describing graphs. It consists of a list of node definitions, which map node IDs to labels, followed by a list of edges, which specify node pairs and an optional edge label. Node IDs can be arbitrary identifiers, whereas labels for both nodes and edges are plain strings. The graph may be interpreted as a directed or undirected graph. For directed graphs, to specify the concept of bidirectionality in an edge, one may either specify two edges (forward and back), or differentiate the edge by means of a label. For more powerful specification of graphs, see the other graph file formats below.

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