A detailed list of supported formats can be displayed using the formatlist command.
formatlist
The default behavior is to print a plain-text list of formats:
formatlist-txt
Prints the list of formats as plain-text:
formatlist -txt-html
Prints the list of formats as HTML:
formatlist -html-xml
Prints the list of formats as XML:
formatlist -xml-help
Displays the usage information:
formatlist -help