2014
RASQAL_EXPR_MD5 was added in 0.9.26
rasqal_new_4op_expression was added in 0.9.28
Added new enum values from 0.9.28 - 0.9.30

0.9.28: RASQAL_LITERAL_DATE
0.9.29: RASQAL_EXPR_STRUUID and RASQAL_EXPR_UUID
0.9.30: RASQAL_GRAPH_PATTERN_OPERATOR_VALUES