To specify what to do with each value of each attribute to which AttrSectionName is assigned in [ElemSectionName] (see §6.5.2 Listing attributes whose values can affect output formats):
[AttrSectionName] ; attribute value = prefix value1 = prefix1 value2 = prefix2 . . .
The attribute value can include wildcards. DITA2Go considers attribute values in the order they are listed in [AttrSectionName]; the first attribute value in the list that matches the value for a given instance of an element determines the prefix applied to the format name for that instance of that element. If the prefix assigned to a value is “*”, the attribute value itself becomes the prefix. If the prefix is blank, no prefix is applied for that value.
[StepImportancePrefixes] required = ReqStep optional = OptStep
[ImportancePrefixes] required = Req optional = Opt * = *
These default settings for required and optional values of the step element importance value are located in configuration template %omsyshome%\d2g\system\config\d2g_config.ini; see §39.1.3 Understanding how templates are chained together.
[NoteTypePrefixes] note = warning = warn * = *
In this last example, a given <note> element would be mapped to a format name prefixed according to the value of the type element: