The scxml header of the Eight Lonely Rooks example is not sufficient.

[ghost]

Currently, the scxml header of the Eight Lonely Rooks example is:

However, when running, the example throws:
org.xml.sax.SAXParseException; lineNumber: 12; columnNumber: 69; The prefix "dg" for element "dg:assign" is not bound.

The scxml header of the Eight Lonely Rooks example needs to include:
xmlns:dg="org.finra.datagenerator"

Also, the following may not be necessary:
xmlns:cs="http://commons.apache.org/scxml"

[mibrahim]

fixed by #302