diff --git a/src/Jsvrcek/ICS/CalendarExport.php b/src/Jsvrcek/ICS/CalendarExport.php
index a337d0a..74e7d59 100755
--- a/src/Jsvrcek/ICS/CalendarExport.php
+++ b/src/Jsvrcek/ICS/CalendarExport.php
@@ -39,6 +39,14 @@ public function __construct(CalendarStream $stream, Formatter $formatter)
         $this->stream = $stream;
         $this->formatter = $formatter;
     }
+    
+    /**
+     * @return CalendarStream
+     */
+    public function getStreamObject()
+    {
+        return $this->stream;
+    }
 
     /**
      * @return string
@@ -136,7 +144,10 @@ public function getStream()
                 
                     if ($event->getRecurrenceRule() instanceof RecurrenceRule)
                         $this->stream->addItem($event->getRecurrenceRule()->__toString());
-                
+                    
+                    if ($event->getSequence())
+                        $this->stream->addItem('SEQUENCE:'.$event->getSequence());
+                    
                 $this->stream->addItem('STATUS:'.$event->getStatus())
                     ->addItem('SUMMARY:'.$event->getSummary())
                     ->addItem('DESCRIPTION:'.$event->getDescription());
diff --git a/src/Jsvrcek/ICS/CalendarStream.php b/src/Jsvrcek/ICS/CalendarStream.php
index de8fd87..5fe9444 100644
--- a/src/Jsvrcek/ICS/CalendarStream.php
+++ b/src/Jsvrcek/ICS/CalendarStream.php
@@ -9,6 +9,12 @@ class CalendarStream
     //length of line in bytes
     const LINE_LENGTH = 70;
     
+    /**
+     * echo items as they are set rather than building stream in memory, for use with streaming a large calendar 
+     * 
+     * @var boolean
+     */
+    private $doImmediateOutput = false;
     
     /**
      * 
@@ -16,6 +22,15 @@ class CalendarStream
      */
     private $stream = '';
     
+    
+    /**
+     * @param boolean $doImmediateOutput
+     */
+    public function setDoImmediateOutput($doImmediateOutput)
+    {
+        $this->doImmediateOutput = $doImmediateOutput;
+    }
+    
     /**
      * resets stream to blank string
      */
@@ -32,42 +47,45 @@ public function getStream()
         return $this->stream;
     }
     
-    /**
-     * splits item into new lines if necessary
+    /**
+     * splits item into new lines if necessary
      * @param string $item
-     * @return CalendarStream
-     */
-    public function addItem($item)
+     * @return CalendarStream
+     */
+    public function addItem($item)
     {
-    	$line_breaks = array("\r\n","\n", "\r");
-    	$item = str_replace($line_breaks,'\n',$item);
-
         //get number of bytes
         $length = strlen($item);
         
         $block = '';
-        
-        if ($length > 75)
+        
+        if ($length > 75)
         {
             $start = 0;
             
             while ($start < $length)
-            {
+            {
                 $block .= mb_strcut($item, $start, self::LINE_LENGTH, 'UTF-8');
                 $start = $start + self::LINE_LENGTH;
                 
                 //add space if not last line
                 if ($start < $length) $block .= Constants::CRLF.' ';
-            }
-        }
-        else
+            }
+        }
+        else
+        {
+            $block = $item;
+        }
+    
+        $this->stream .= $block.Constants::CRLF;
+        
+        if ($this->doImmediateOutput)
         {
-            $block = $item;
+            echo $this;
+            $this->reset();
         }
-    
-        $this->stream .= $block.Constants::CRLF;
         
-        return $this;
+        return $this;
     }
     
     /**
@@ -77,4 +95,4 @@ public function __toString()
     {
         return $this->getStream();
     }
-}
+}
\ No newline at end of file
diff --git a/src/Jsvrcek/ICS/Model/Calendar.php b/src/Jsvrcek/ICS/Model/Calendar.php
index 82fd128..fe3213b 100644
--- a/src/Jsvrcek/ICS/Model/Calendar.php
+++ b/src/Jsvrcek/ICS/Model/Calendar.php
@@ -2,6 +2,8 @@
 
 namespace Jsvrcek\ICS\Model;
 
+use Jsvrcek\ICS\Utility\Provider;
+
 class Calendar
 {
     /**
@@ -39,24 +41,24 @@ class Calendar
      * @var \DateTimeZone $timezone
      */
     private $timezone;
-
+    
     /**
-     *
-     * @var array $events
+     * 
+     * @var Provider
      */
-    private $events = array();
+    private $events;
     
     /**
      * 
-     * @var array $todos
+     * @var Provider
      */
-    private $todos = array();
+    private $todos;
     
     /**
      * 
-     * @var array $freeBusy
+     * @var Provider
      */
-    private $freeBusy = array();
+    private $freeBusy;
 
     /**
      * 
@@ -64,6 +66,33 @@ class Calendar
     public function __construct()
     {
         $this->timezone = new \DateTimeZone('America/New_York');
+        $this->events = new Provider();
+        $this->todos = new Provider();
+        $this->freeBusy = new Provider();
+    }
+    
+    /**
+     * For use if you want CalendarExport::getStream to get events in batches from a database during
+     * the output of the ics feed, instead of adding all events to the Calendar object before outputting
+     * the ics feed. 
+     * - CalendarExport::getStream iterates through the Calendar::$events internal data array. The $eventsProvider 
+     *     closure will be called every time this data array reaches its end during iteration, and the closure should
+     *     return the next batch of events 
+     * - A $startKey argument with the current key of the data array will be passed to the $eventsProvider closure
+     * - The $eventsProvider must return an array of CalendarEvent objects
+     * 
+     *  Example: Calendar::setEventsProvider(function($startKey){
+     *      //get database rows starting with $startKey
+     *      //return an array of CalendarEvent objects
+     *  })
+     * 
+     * @param \Closure $eventsProvider
+     * @return \Jsvrcek\ICS\Model\Calendar
+     */
+    public function setEventsProvider(\Closure $eventsProvider)
+    {
+        $this->events = new Provider($eventsProvider);
+        return $this;
     }
 
     /**
@@ -189,7 +218,7 @@ public function setTimezone(\DateTimeZone $timezone)
     }
 
     /**
-     * @return array
+     * @return Provider
      */
     public function getEvents()
     {
@@ -202,7 +231,7 @@ public function getEvents()
      */
     public function addEvent(CalendarEvent $event)
     {
-        $this->events[] = $event;
+        $this->events->add($event);
         return $this;
     }
     
diff --git a/src/Jsvrcek/ICS/Model/CalendarEvent.php b/src/Jsvrcek/ICS/Model/CalendarEvent.php
index 7c2ca59..f6fba0d 100755
--- a/src/Jsvrcek/ICS/Model/CalendarEvent.php
+++ b/src/Jsvrcek/ICS/Model/CalendarEvent.php
@@ -107,6 +107,12 @@ class CalendarEvent
      */
     private $recuringId;
     
+    /**
+     * 
+     * @var integer
+     */
+    private $sequence;
+    
     /**
      * 
      * @var array $attendees
@@ -486,6 +492,24 @@ public function setRecuringId($recuringId)
         $this->recuringId = $recuringId;
         return $this;
     }
+    
+    /**
+     * @return integer
+     */
+    public function getSequence()
+    {
+        return $this->sequence;
+    }
+    
+    /**
+     * @param integer $sequence
+     * @return \Jsvrcek\ICS\Model\CalendarEvent
+     */
+    public function setSequence($sequence)
+    {
+        $this->sequence = $sequence;
+        return $this;
+    }
 
     /**
      * 
diff --git a/src/Jsvrcek/ICS/Utility/Provider.php b/src/Jsvrcek/ICS/Utility/Provider.php
new file mode 100644
index 0000000..bc1cd7a
--- /dev/null
+++ b/src/Jsvrcek/ICS/Utility/Provider.php
@@ -0,0 +1,110 @@
+<?php
+
+namespace Jsvrcek\ICS\Utility;
+
+class Provider implements \Iterator
+{
+    /**
+     * 
+     * @var \Closure
+     */
+    private $provider;
+    
+    /**
+     * 
+     * @var array
+     */
+    public $data = array();
+    
+    /**
+     *
+     * @var array
+     */
+    public $manuallyAddedData = array();
+    
+    /**
+     * 
+     * @var integer
+     */
+    private $key;
+    
+    /**
+     * @param \Closure $provider An optional closure for adding items in batches during iteration. The closure will be
+     *     called each time the end of the internal data array is reached during iteration, and the current data
+     *     array key value will be passed as an argument. The closure should return an array containing the next 
+     *     batch of items.
+     */
+    public function __construct(\Closure $provider = null)
+    {
+        $this->provider = $provider;
+    }
+    
+    /**
+     * for manually adding items, rather than using a provider closure to add items in batches during iteration
+     * Cannot be used in conjunction with a provider closure!
+     * 
+     * @param mixed $item
+     */
+    public function add($item)
+    {
+        $this->manuallyAddedData[] = $item;
+    }
+    
+    /* (non-PHPdoc)
+     * @see Iterator::current()
+     */
+    public function current()
+    {
+        return current($this->data);
+    }
+    
+    /* (non-PHPdoc)
+     * @see Iterator::key()
+     */
+    public function key()
+    {
+        return $this->key;
+    }
+    
+    /* (non-PHPdoc)
+     * @see Iterator::next()
+     */
+    public function next()
+    {
+        array_shift($this->data);
+        $this->key++;
+    }
+    
+    /* (non-PHPdoc)
+     * @see Iterator::rewind()
+     */
+    public function rewind()
+    {
+        $this->data = array();
+        $this->key = 0;
+    }
+    
+    /** 
+     * get next batch from provider if data array is at the end
+     * 
+     * (non-PHPdoc)
+     * @see Iterator::valid()
+     */
+    public function valid()
+    {
+        if (count($this->data) < 1)
+        {
+            if ($this->provider instanceof \Closure)
+            {
+                $this->data = $this->provider->__invoke($this->key);
+            }
+            else
+            {
+                $this->data = $this->manuallyAddedData;
+                $this->manuallyAddedData = array();
+            }
+        }
+        
+        return count($this->data) > 0;
+    }
+}
\ No newline at end of file
diff --git a/tests/Jsvrcek/ICS/Tests/CalendarExportTest.php b/tests/Jsvrcek/ICS/Tests/CalendarExportTest.php
index da301d2..1636631 100644
--- a/tests/Jsvrcek/ICS/Tests/CalendarExportTest.php
+++ b/tests/Jsvrcek/ICS/Tests/CalendarExportTest.php
@@ -50,7 +50,8 @@ public function testGetStream()
             ->setEnd(new \DateTime('31 October 2013'))
             ->setSummary('Oktoberfest at the South Pole')
             ->addAttendee($attendee)
-            ->setOrganizer($organizer);
+            ->setOrganizer($organizer)
+            ->setSequence(3);
         
         $rrule = new RecurrenceRule(new Formatter());
         $rrule->setFrequency(new Frequency(Frequency::MONTHLY))
@@ -64,8 +65,30 @@ public function testGetStream()
             ->setTimezone(new \DateTimeZone('Antarctica/McMurdo'))
             ->addEvent($event);
         
+        //create second calendar using batch event provider
+        $calTwo = new Calendar();
+        $calTwo->setProdId('-//Jsvrcek//ICS//EN2')
+            ->setTimezone(new \DateTimeZone('Arctic/Longyearbyen'));
+        
+        $calTwo->setEventsProvider(function($start){
+            $eventOne = new CalendarEvent();
+            $eventOne->setUid('asdfasdf@example.com')
+                ->setStart(new \DateTime('2016-01-01 01:01:01'))
+                ->setEnd(new \DateTime('2016-01-02 01:01:01'))
+                ->setSummary('A long day');
+            
+            $eventTwo = new CalendarEvent();
+            $eventTwo->setUid('asdfasdf@example.com')
+                ->setStart(new \DateTime('2016-01-02 01:01:01'))
+                ->setEnd(new \DateTime('2016-01-03 01:01:01'))
+                ->setSummary('Another long day');
+            
+            return ($start > 0) ? array() : array($eventOne, $eventTwo);
+        });
+        
         $ce = new CalendarExport(new CalendarStream(), new Formatter());
-        $ce->addCalendar($cal);
+        $ce->addCalendar($cal)
+            ->addCalendar($calTwo);
         
         $stream = $ce->getStream();
         
diff --git a/tests/test.ics b/tests/test.ics
index 7255b25..77599c7 100644
--- a/tests/test.ics
+++ b/tests/test.ics
@@ -16,6 +16,7 @@ UID:lLKjd89283oja89282lkjd8@example.com
 DTSTART:20131001T000000Z
 DTEND:20131031T000000Z
 RRULE:FREQ=MONTHLY;INTERVAL=2;COUNT=6;BYDAY=2SA
+SEQUENCE:3
 STATUS:
 SUMMARY:Oktoberfest at the South Pole
 DESCRIPTION:
@@ -26,3 +27,33 @@ ORGANIZER;SENT-BY="mary@example.com";CN=Sue Jones;LANGUAGE=en:mailto:s
  ue@example.com
 END:VEVENT
 END:VCALENDAR
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//Jsvrcek//ICS//EN2
+CALSCALE:GREGORIAN
+METHOD:PUBLISH
+BEGIN:VTIMEZONE
+TZID:Arctic/Longyearbyen
+BEGIN:STANDARD
+DTSTART:19700101T000000
+TZOFFSETTO:+0100
+TZOFFSETFROM:+0100
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+UID:asdfasdf@example.com
+DTSTART:20160101T010101Z
+DTEND:20160102T010101Z
+STATUS:
+SUMMARY:A long day
+DESCRIPTION:
+END:VEVENT
+BEGIN:VEVENT
+UID:asdfasdf@example.com
+DTSTART:20160102T010101Z
+DTEND:20160103T010101Z
+STATUS:
+SUMMARY:Another long day
+DESCRIPTION:
+END:VEVENT
+END:VCALENDAR