Syntax 1, syntax 2, syntax 3, …

When you work on a complicated syntax, periodically save the current version under a different name.

To add, this way of versioning

• PrepareData_v1.sps
• PrepareData_v2.sps
• PrepareData_v3.sps
• …

looks better, clearly depicts work progress and is arranged alphabetically in the list of files. Compare with this one:

• PrepareData 01.03.2013.sps
• FINAL data preparation syntax.sps
• !!!!VERY FINAL .sps
• …