The Javadoc and PDF are inconsistent concerning these values. Javadoc says 1 to 5, PDF says 0 to 6. Implementation follows Javadoc, so suggest PDF should be changed to be consistent.

Change to the above suggestion: changing implementation and Javadoc so they allow 0 to 6 should not affect existing code, while changing everything to allow only 1 to 5 will break code that previously worked on independent implementations that followed the PDF spec. IBM has such an implementation, and WebSphere is such code, so changing to 0-6 is the right solution.
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