You can use macros to insert any content into the output stream. Because the DITA2Go macro language is Turing-complete, the DITA2Go macro facility is powerful enough to let you insert anything in RTF output, and do almost anything to HTML or XML output. Topics include:
§37.1 Defining and invoking macros
§37.2 Accessing DITA2Go macro libraries
§37.4 Using multiple-value list variables
§37.5 Accessing settings with configuration macros
§37.6 Using expressions in macros
§37.7 Passing a parameter to a macro
§37.9 Deploying macros and macro variables