By default, all content is included in DITA2Go output, unless the action conditional processing attribute in a ditaval file for the content specifies exclude, or a corresponding setting in your configuration file specifies the attribute value(s) required to trigger exclusion.
To specify the default action for all attributes:
[ConditionOptions]
; ConditionalDefaults = include (default) or exclude, for all
; attributes unless overridden in the [ConditionalDefaults] section.
ConditionalDefaults = include
To specify a different default action for individual attributes (for example):
[ConditionalDefaults]
; attribute name = actions to use for any props not set explicitly,
; can be include (default) or exclude.
audience = exclude
In this example, all values for audience would be excluded by default.