For complex event processing rules, the characters that can be specified in CSV column item names, XML tag names, and attribute names have the following constraints:
The first character must be a letter (a to z or A to Z).
The second and subsequent characters must be letters (a to z or A to Z), digits (0 to 9), or underscores (_).
The reserved words of complex event processing rules cannot be used, regardless of case.
Refer to Chapter 1, "Complex Event Processing Language Reference" in the Developer's Reference for information on the reserved words of complex event processing rules.
Please note that the rules are case-sensitive.