Make DateTime available without package prefix in epl

epl/trading_system_1.epl

@@ -97,7 +97,7 @@ insert into SMACloseStream
 -- A stream that feeds B1 and B2.  Each event contains a double
 -- precision floating point value "low", and a timestamp called
 -- "time".
-create schema BStream as (low double, time org.joda.time.DateTime)
+create schema BStream as (low double, time DateTime)
 
 -- Listen to the last "RefSize" number of SMACloseStream events. Look
 -- for an OHLC bar with a lower average close than its neighbors.  Add
@@ -111,7 +111,7 @@ insert into BStream
 
 
 -- Define B1 to contain the same fields as BStream
-create schema B1 (low double, time org.joda.time.DateTime)
+create schema B1 (low double, time DateTime)
 
 -- B1 contains the most recent low value and time from BStream.
 -- This is the last time an average close was lower
@@ -122,14 +122,14 @@ insert into B1 select prev(0, low) as low, prev(0, time) as time
 
 -- B2 contains the *second* most recent occurrence in BStream, but is
 -- otherwise the same as B1.
-create schema B2 (low double, time org.joda.time.DateTime)
+create schema B2 (low double, time DateTime)
 
 insert into B2 select prev(1, low) as low, prev(1, time) as time
   from BStream#length(RefSize)
 
 
 -- A stream that feeds P1 and P2.
-create schema PStream as (low double, time org.joda.time.DateTime)
+create schema PStream as (low double, time DateTime)
 
 -- Find an OHLC bar with a higher average close than its neighbors.
 -- Add that low value and its timestamp to the stream.
@@ -142,13 +142,13 @@ insert into PStream
 -- This is the last time an average close was higher
 -- than the ones before and after.
 -- Since the time is included in the event, no separate PT1 is needed.
-create schema P1 (low double, time org.joda.time.DateTime)
+create schema P1 (low double, time DateTime)
 
 insert into P1 select prev(0, low) as low, prev(0, time) as time
   from PStream#length(RefSize)
 
 -- P2 contains the second most recent occurrence in PStream.
-create schema P2 (low double, time org.joda.time.DateTime)
+create schema P2 (low double, time DateTime)
 
 insert into P2 select prev(1, low) as low, prev(1, time) as time
   from PStream#length(RefSize)
@@ -167,9 +167,9 @@ insert into MaxHigh3Window
   select max(high) as high from OHLCStream#length(3)
 
 
--- Long entry events contain the current tick's midpoint value and
--- timestamp.
-create schema LongEntryStream as (current BigDecimal, time org.joda.time.DateTime, instrument String)
+-- Long entry events contain the current tick's midpoint value,
+-- timestamp, and instrument name.
+create schema LongEntryStream as (current BigDecimal, time DateTime, instrument String)
 
 -- The long entry calc below is translated from this entry in the
 -- spreadsheet:
@@ -202,7 +202,7 @@ insert into LongEntryStream
 --
 -- LongEntryDistinct filters out duplicate LongEntryStream events,
 -- leaving a maximum of one event per tick.
-create schema LongEntryDistinct as (current BigDecimal, time org.joda.time.DateTime,
+create schema LongEntryDistinct as (current BigDecimal, time DateTime,
                                     instrument String, units int)
 
 insert into LongEntryDistinct