This request is about adding a "Export graph as XML without layout" option to yEd.
This new file format would save only nodes, relations, groups and labels. Icons could be saved by using their filenames and/or "src" attributes (so no more embedding them as Base64).
Rational : yEd generates large GraphML files because they contain both "structure" and "layout" (in the yWorks namespace), whereas programmers want only the "structure" part. Writing an XSL stylesheet is already possible, but it would be easier to transform a file containing only useful (that is, structural) information.
Use case : a programmer wants to use yEd as a tool to modelize something using a graph. Once he's happy with his modelization, he saves it in this new "structural XML" format, and starts building something around it.
EDIT : replaced "save" by "export" (this would not be a in/out file format, only a "out" one)