throw new Error("Parser must be on START_ELEMENT to read next element.");

In NODE v4.4.0 operation, the above error is thrown in the example due to incorrect XML node parsing. Using

> unmarshaller.unmarshalFile('purchaseOrder.xml',...

instead of

> unmarshaller.unmarshalURL('purchaseOrder.xml',...

Corrects the problem. This issue doesn't occur in the browser version using jasonix-all. You might want to include this caveat in your example code. I spent hours tracking it down.

Thanks for this wonderful tool. Very useful.