The text type database map and its switches are described in ?§23.7.26 on page 941.
22.1.3.1 Class by replacing files with database lookups in mc macros
Several mc macros are used to fill class macros withvalues. They are listed in
Table 22-1, along with the class macros they fill. Note that the classes shown should
not be used directly because there is no guarantee that they will continue to be available
in the future. To be safe, always use the mc macro instead. To reinforce this precaution
in the descriptions that follow, we use the mc name for the class (as the
EXPOSED_USER class) instead of the class macro name (as the $=E class).
It is possible to fill these class macros from database maps using these mc macros.
Instead of the filename, just place the database lookup expression between the trailing
parentheses of the mc macro. For example, consider this way of filling the
RELAY_DOMAIN class withvalues from the access database, assuming the following
entry exists in your access database:
DomainList: our.domain their.domain another.domain
Recall that the RELAY_DOMAIN class (?§7.4.1.1 on page 269) determines which
domains you want to relay for. The idea here is that you want to fill it with the values
Table 22-1. mc macros used to fill class macros
mc macro ?§ Class macro
CANONIFY_DOMAIN_FILE ?§17.8.33 on page 634 $={Canonify}
confCT_FILE ?§17.
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