addressed Sattam's comments; added code to enable loading year-month-duration and day-time-duration through external data
diff --git a/asterix-runtime/src/main/resources/adm.grammar b/asterix-runtime/src/main/resources/adm.grammar
index 4d4158f..80e2cd4 100644
--- a/asterix-runtime/src/main/resources/adm.grammar
+++ b/asterix-runtime/src/main/resources/adm.grammar
@@ -29,6 +29,8 @@
INTERVAL_TIME_CONS = string(interval-time)
INTERVAL_DATE_CONS = string(interval-date)
INTERVAL_DATETIME_CONS = string(interval-datetime)
+YEAR_MONTH_DURATION_CONS = string(year-month-duration)
+DAY_TIME_DURATION_CONS = string(day-time-duration)
NULL_LITERAL = string(null)
TRUE_LITERAL = string(true)