MySQL Versioning Scheme

I am curious to know the versioning system of MySQL. What’s going behind the scene? Can someone please let me know the documentation to understand logic behind MySQL versioning system?

Like after MySQL 5.1, sun released MySQL 5.5 skipped number in between 5.2, 5.3, and 5.4. Also wish to get to know about minor release numbers e.g. 5.1.30, 5.1.31 etc.

What are the logics/reasons behind? I want to grasp MySQL versioning scheme.

can someone please help me out on this.

Read this: Choosing Version