ROADMAP INTRODUCTION RESEARCH ON ELLIPSIS SENTENCE FRAGMENTS : HEAD AS ELLIPSIS LICENSORS HOW TO ENCODE [E]-FEATURE AT PF/SM VARIABILITY OF TRANSFER/SPELL OUT DOMAIN NON-SIMULTANEOUS SPELL-OUT THE VARIABLE WAYS OF APPLYING SPELL-OUT ENCODING INFO TO INTERFACES VARIABILITY OF SPELL OUT DOMAIN AND CLAUSAL ELLIPSIS SELECTED REFERENCES