From Seo Wiki - Search Engine Optimization and Programming Languages
XGMML (the eXtensible Graph Markup and Modeling Language) is an XML application based on GML which is used for graph description. Technically, while GML is not related to XML nor SGML, XGMML is an XML application that is so designed that there's a 1:1 relation towards GML for trivial conversion between the two formats.
Applications supporting XGMML
Other graph file formats
- GraphML, an XML-based graph file format
- GXL, graph exchange format based on XML
- LOGML, a markup language enabling data mining for web server logs. LOGML is derived from XGMML.
- XGMML is very closely tied to: Graph Modelling Language (GML)