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Theme

SEMANTICS: the object that is located or relocated in space. EXAMPLE: the glass is a theme both in (i)a (location) and (i)b (relocation).

(i)  a	The glass is on the table
     b	The glass fell from the table
(ii) a	The glass is mine 
     b	John gave the glass away
The interpretation of thematic roles has been generalized in terms of 'abstract space'; then, a theme is what is in a state or in a change of state, and the notion applies to the glass in (ii)a (state) and (ii)b (change of state) as well.
LIT. Fillmore, C.J. (1968)
Gruber, J. (1965)
Jackendoff, R. (1990)
Jackendoff, R. (1983)