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DGML is an XML-based file format for directed graphs.
Introduction to DGML
Here is what a simple directed graph with three nodes and two links between them looks like
which looks like this:
The complete XSD schema for DGML is available at [1]. DGML not only allows describing nodes and links in a graph, but also annotating those nodes and links with any user defined property and/or category.
References
DGML Wikipedia(Text) CC BY-SA