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Associates names with formatter factories, which then can be referred by the
#setDateTimeFormat(String),
#setDateTimeFormat(String), and
#setDateTimeFormat(String) settings with values starting with @name
. Beware, if you specify any custom
formats here, an initial
@ followed by a letter will have special meaning in number/date/time/datetime
format strings, even if
Configuration#getIncompatibleImprovements() is less
than 2.3.24 (starting with
Configuration#getIncompatibleImprovements() 2.3.24
@ always has special meaning).