{Rich­Text Format Conversions
I haven't written this document yet, but in the meantime you can look at the documentation for the jtagconvert.tcl library, which implements format conversions.  The section Comments on Formats is particularly useful; it mentions some of the major shortcomings of jstools' conversions to various formats.

Thanks to Miguel Santana <santana@imag.fr> for permission to use the /reencodeISO procedure from his a2ps program when converting rich­text to PostScript.
} {{{jdoc:xref:link {2.99 2.114 2.174 2.193 2.264 2.271}} {richtext:font:roman {2.0 2.99 2.114 2.174 2.193 2.264 2.271 4.25 4.42 4.69 4.81 4.101 4.105 5.0}} {richtext:font:bold {2.99 2.114 2.264 2.271}} {richtext:font:bolditalic {2.174 2.193}} {richtext:font:typewriter {4.25 4.42 4.69 4.81 4.101 4.105}} {richtext:font:heading0 {1.0 2.0}} {jdoc:link:jstools.jdoc {2.264 2.271}} {jdoc:link:jtagconvert.tcl.jdoc {2.99 2.114}} {jdoc:link:jtagconvert.tcl.jdoc#Comments_on_Formats {2.174 2.193}}} {{abbrevstart 5.0} {abbrevend 5.0} {insert 4.0} {anchor 4.33} {current 1.27}}}