XML and 

• We are in the process of changing the external data format from java object streams to XML. The ultimate goal is to define a common DTD for all graph transformation tool, for which we work together with other institutes. Our current version of the DTD in use can be downloaded here and here.
  As an example of AGG and XML in action you can see the external representation of the HTML Browser graph grammar.
  Another grammar with a type graph you can see here. There is the grammar of the Partial business model of a shop from our Examples and Screenshots page.

• AGG supports import / export for GXL - an XML-based file exchange format for graphs and graph transformation systems.
  As an example of the export to GXL you can see ShippingCompany.gxl of the ShippingCompany.ggx graph grammar.
• AGG version 1.2.1 supports export for a new version of GTXL. GTXL is an XML-based file exchange format for graph transformation systems. The syntax of a GTXL document is expressed in the DTD (Document Type Definition) gtxl.dtd.
  As an example of the export to GTXL you can see ShippingCompany.gtxl of the ShippingCompany.ggx graph grammar.
• AGG version 1.2.3 (and later) supports export for a new version of GTXL which was presented and discussed at GraBaTs'04. GTXL is an XML-based file exchange format for graph transformation systems. The syntax of a GTXL document is expressed in the DTD (Document Type Definition) gtxl.dtd.
  As an example of the export to GTXL you can see ShippingCompany.gtxl of the ShippingCompany.ggx graph grammar.