> both are optional. thanks Grahame,
I thought they had to be optional (given the ED datatype recursively refers to itself it would be hard to implement if they were mandatory!).. am I misreading the UML diagram notation or are the diagrams not up to date? It uses notation like thumbnail: ED[1] which I would read as a mandatory attribute. Or is the optionality introduced using the null_flavour attribute on DATA_VALUE? Andrew _______________________________________________ openEHR-technical mailing list openEHR-technical at openehr.org http://www.chime.ucl.ac.uk/mailman/listinfo/openehr-technical
