As was mentioned above, corpora that are manually annotated for (expressions manifesting) conceptual mappings would be an invaluable resource for corpus-based research.An appropriate annotation scheme must define (i) a reliable procedure for discovering instances of the phenomenon in question, (ii) the attributes that are considered relevant for each instance and the set of values that each of these attributes can take as well as guidelines as to how these values are to be assigned, and (iii) an annotation format. Let us briefly consider each of these aspects in turn.