GML

Hierarchical text format for graphs with arbitrary key-value attributes.

FeatureSupportNotes
Attributes on Edges✅Arbitrary key-value pairs
Attributes on Graphs✅Arbitrary key-value pairs
Attributes on Nodes✅Arbitrary key-value pairs
Directed Edges✅Via directed 1 on graph
Edge Labels✅Via label key
Edges on Edges❌
Hyperedges❌
Mixed-directionality Edges❌
Multiple Graphs per Document✅
Nested Graphs in Edges❌
Nested Graphs in Graphs✅Hierarchical structure
Nested Graphs in Nodes✅Via nested graph elements
Node Labels✅Via label key
Nodes✅
Typed Edges✅Via custom attribute
Undirected Edges✅

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Output Format

All Formats: Adjacency List (NetworkX)| BioGRID Tab 3.0| Chaco| Connected JSON| CytoScape JSON| DOT (GraphViz)| Edge List| GDF| GEXF| gJGF| GML| Graph6| GraphML| GXL| JGF| Matrix Market| Nested Network Format| Netdraw VNA| OCIF| Pajek| PSI-MI Tab 2.5| SBML| TGF| UCINET DL| VOSviewer JSON| XGMML