Conversion of a string to a "DEXi value" (see DEXiR-package) according to "old"
DEXi syntax. In .dxi files, the old syntax is used with OPTION XML tags.
The reason for replacing the old with the new syntax (see dexi_value()) was
that the old syntax can not unambiguously represent value distributions.
Usage
dexi_option_value(x)
Value
A numeric vector. The conversion uses rule_values(x, add = 1).
For special-type parameters, the conversion results are:
x result
------------------------------+------
NULL NULL
a non-character object NA
"" or "*" "*"
a string starting with "undef" NA
Arguments
x
character(1). Contains a sequence of characters, each of which represents an individual ordinal number.