I think this is not very well described in rexref.
I would suggest to add
Before this sentence:
The [] method with no arguments will return the currently associated default
value.
This little description and examples:
Tails for compound variables are normally specified by symbols separated by
periods.
An alternative is to specify the tail as a bracketed list of expressions
separated by commas.
The expressions are evaluated to character strings-
These are concatenated with intervening periods and the resulting string is
used as tail.
This notation can be used in assignments to compound variables as well as
when referencing them.
Examples:
a.[1+2,3+4]=17 /* tail used: 3.7 */
Say a.3.7 /* => 17 */
v1='1+2'
v2='3+4'
a.v1.v2=18 /* tail used: '1+2.3+4' */
Say a.['1+2','3+4'] /* => 18 */
Parse Value '1 2 3' With . a.[1,1+1] .
Say a.1.2 /* => 2 */
Anyone with me?
Regards
Walter
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