http://onionworks.net/2006/data/editing
createBinary (filename : string, mimeType : string) : string
The method “createBinary” writes a binary data object on the basis of a physical file or a link to a binary method in onion.net and returns the ReferenceIdentifier as the result.
If the binary object cannot be produced in onion.net, then no ReferenceIdentifier is returned.