SVG

  http://www.w3.org/Graphics/SVG/

GraphML

  http://graphml.graphdrawing.org/

GXL (Graph eXchange Language)

  http://www.gupro.de/GXL/
  http://gxl.sourceforge.net/
  - GXL が使用されている視覚化ツール
    Graph Tool
    GVF/Royere
    SHriMP
    yFiles
    JGraph[2004-01-06-1]
    TouchGraph
    Graphviz[2003-12-01-3]
  - GXL - Examples
    http://www.gupro.de/GXL/examples/

GML

  non-XML
  http://www.infosun.fmi.uni-passau.de/Graphlet/GML/

XGMML (eXtensible Graph Markup and Modeling Language)

  http://www.cs.rpi.edu/~puninj/XGMML/
  - XGMML - Examples
    http://www.cs.rpi.edu/~puninj/XGMML/XGMML_EXP/

Reference

  oka326's Front Page - GraphML
  http://www.globe.to/~oka326/?GraphML