<p>The GMF Notation Project provides a standard EMF notational meta model.</p>
<p>The notational meta model is a standard means for persisting diagram information separately from the domain model.</p>
<p>It can also be used as a basis for diagram interchange and was based on the principles in the <a href="http://www.omg.org/cgi-bin/doc?formal/06-04-04">OMG Diagram Interchange Specification</a></p>