Gene,
Generally, you are quite correct. Those rules (read: Guidelines) apply to many softwares I know. But version numbering is usually up to the developers and some developers have a much different idea of minor versus major versioning than others.
For example, I consider the move from SQL Server 2005 all the way to SQL Server 2012 to be very significant. We are, after all, skipping two versions of SQL. That alone, to me, would warrant calling the next release version 7.0.
JamesNT
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