To specify that DITA2Go should apply a prefix to the name of the output format assigned to an element, based on one or more attributes of that element:
[ElementAttrPrefixes]
; element name = section with list of attrs for which
; prefixes should possibly be applied to the format name
element = ElemSectionName
[ElementAttrPrefixes]
note = NoteAttrPrefixes
step = StepAttrPrefixes
* = AttributePrefixes
The element name can include wildcards. These default settings are located in configuration template %omsyshome%\d2g\system\config\d2g_config.ini; see §39.1.3 Understanding how templates are chained together.
The setting for <note> directs DITA2Go to look up the attributes listed in configuration section [NoteAttrPrefixes], and to use those attributes to determine which Note format to apply to a given instance of <note>; or, in effect, how to modify the base [Note] format. And similarly for <step>.
The last setting above directs DITA2Go to look up the attributes listed in configuration section [AttributePrefixes] for all elements. (The importance attribute is included there by default; see §6.5.2 Listing attributes whose values can affect output formats.)