Take a list of strings and an associative list that maps strings to sosofos and return an appended sosofo.
(This function is used for a particular task in the DocBook stylesheets. It may not be particularly general, but its in dblib.dsl' because there is nothing DTD-specific about it.)
Given the string list ("what is " "1" " " "+" " " "1") and the associative list (("1" (literal "one")) ("2" (literal "two")) ("+" (literal "plus"))), (string-list-sosofo) returns the sequence of sosofos equivalent to (literal "what is one plus one").