+The chameleon nature of (3), by the way (a description that is equally
+good at describing any object), makes it particularly well suited as a
+gloss on pronouns such as *it*. In the system of [Jacobson 1999]
+(http://www.zas.gwz-berlin.de/mitarb/homepage/sauerland/jacobson99.pdf)
+pronouns denote (you guessed it!) identity functions...
+