I have a set of diagrams created in the StarUML program. Is there a way to import them into Modelio?

You can import the model using XMI.
Modelio provides the XMI import feature.
Modelio is compatible with the EMF 3.0.0 specification or the UML 2.1.1, UML 2.2, UML 2.3 or UML 2.4.1 specifications from the OMG.

Thanks. But that doesn't work for the StarUML files. My guess is that it is not going to be possible to import a StarUML *.uml file into Modelio.

Modelio returns with an error (after several minutes) when importing *.uml from StarUML. I tried exporting within StarUML to *.xmi, but Modelio returns with an error for that too.

A look at the StarUML help leads me to believe it uses UML 1.3 and XMI 1.1.

Modelio says it can import UML 2.

Hi moreorless,

You are right. Actually, Modelio can only import UML2.x XMI2.1 files...
So in the second line of your export you should have the following attributes.
xmi:version="2.1" xmlns:xmi="schema.omg.org/spec/XMI/2.1"

If it not the case, could you reexport your StartUML model in a new format?

Regards,

Etienne