diff --git a/MARCspec.php b/MARCspec.php
index 0899e20..6b6703f 100755
--- a/MARCspec.php
+++ b/MARCspec.php
@@ -17,7 +17,7 @@
 * For Specification of MARC spec as string see
 * <http://cklee.github.io/marc-spec/marc-spec.html>
 */
-class MARCspec implements MARCspecInterface, \JsonSerializable, \ArrayAccess
+class MARCspec implements MARCspecInterface, \JsonSerializable, \ArrayAccess, \IteratorAggregate
 {
 
     /**
@@ -674,4 +674,9 @@ public function offsetUnset($offset)
     {
         throw new \BadMethodCallException("Offset $offset can not be unset.");
     }
+    
+    public function getIterator()
+    {
+        return new SpecIterator(["field" => $this->field, "subfields" => $this->subfields]);
+    }
 } // EOC
diff --git a/SpecIterator.php b/SpecIterator.php
new file mode 100755
index 0000000..a6d5b5d
--- /dev/null
+++ b/SpecIterator.php
@@ -0,0 +1,53 @@
+<?php
+/**
+* MARCspec is the specification of a reference, encoded as string, to a set of data 
+* from within a MARC record.
+* 
+* @author Carsten Klee <mailme.klee@yahoo.de>
+* @package CK\MARCspec
+* @copyright For the full copyright and license information, please view the LICENSE 
+* file that was distributed with this source code.
+*/
+namespace CK\MARCspec;
+
+class SpecIterator implements \Iterator
+{
+    private $var = array();
+
+    public function __construct($array)
+    {
+        if (is_array($array))
+        {
+            $this->var = $array;
+        }
+    }
+
+    public function rewind()
+    {
+        reset($this->var);
+    }
+
+    public function current()
+    {
+        $var = current($this->var);
+        return $var;
+    }
+
+    public function key()
+    {
+        $var = key($this->var);
+        return $var;
+    }
+
+    public function next()
+    {
+        $var = next($this->var);
+        return $var;
+    }
+
+    public function valid()
+    {
+        $var = $this->current() !== false;
+        return $var;
+    }
+}
\ No newline at end of file
diff --git a/SubSpec.php b/SubSpec.php
index e00c252..5ad53e1 100755
--- a/SubSpec.php
+++ b/SubSpec.php
@@ -15,7 +15,7 @@
 /**
 * A MARCspec subspec class
 */
-class SubSpec implements SubSpecInterface, \JsonSerializable, \ArrayAccess
+class SubSpec implements SubSpecInterface, \JsonSerializable, \ArrayAccess, \IteratorAggregate
 {
 
     /**
@@ -202,4 +202,15 @@ public function offsetUnset($offset)
     {
         throw new \BadMethodCallException("Offset $offset can not be unset.");
     }
+    
+    public function getIterator()
+    {
+        return new SpecIterator(
+            [
+                "leftSubTerm" => $this->leftSubTerm,
+                "operator" => $this->operator,
+                "rightSubTerm" => $this->rightSubTerm
+            ]
+        );
+    }
 } // EOC
diff --git a/Subfield.php b/Subfield.php
index c22bdf8..a96539c 100755
--- a/Subfield.php
+++ b/Subfield.php
@@ -15,7 +15,7 @@
 /**
 * A MARCspec subfield class
 */
-class Subfield extends PositionOrRange implements SubfieldInterface, \JsonSerializable, \ArrayAccess
+class Subfield extends PositionOrRange implements SubfieldInterface, \JsonSerializable, \ArrayAccess, \IteratorAggregate
 {
 
     /**
@@ -497,4 +497,13 @@ public function offsetUnset($offset)
     {
         throw new \BadMethodCallException("Offset $offset can not be unset.");
     }
+    
+    public function getIterator()
+    {
+        foreach($this as $key => $value)
+        {
+            $_[$key] = $value;
+        }
+        return new SpecIterator($_);
+    }
 } // EOC
diff --git a/Test/MarcSpecTest.php b/Test/MarcSpecTest.php
index ee492fc..f930ca9 100755
--- a/Test/MarcSpecTest.php
+++ b/Test/MarcSpecTest.php
@@ -171,6 +171,49 @@ public function testValidMarcSpec5()
 
     }
     
+    public function testIteration()
+    {
+        $ms = $this->marcspec('245$a-c{$b|$c}{$e}');
+        $count = 0;
+
+        foreach($ms as $key => $value)
+        {
+            $count++;
+        }
+        $this->assertSame(2, $count);
+        
+        $count = 0;
+        foreach($ms['subfields'] as $key => $value)
+        {
+            $count++;
+        }
+        $this->assertSame(3, $count);
+        
+       
+        foreach($ms['subfields'] as $subfield)
+        {
+            $count = 0;
+            foreach($subfield['subSpecs'] as $subSpec)
+            {
+                if(is_array($subSpec))
+                {
+                    $this->assertSame(2, count($subSpec));
+                }
+                else
+                {
+                    foreach($subSpec as $key => $prop)
+                    {
+                        $this->assertTrue(in_array($key,["leftSubTerm","operator","rightSubTerm"]));
+                    }
+                }
+                
+                $count++;
+            }
+            $this->assertSame(2, $count);
+        }
+        
+        
+    }
 
 
 }
diff --git a/composer.json b/composer.json
index 77826b7..8ae561a 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,6 @@
     "type": "library",
     "description": "PHP based MARCspec parser and validator",
     "keywords": [ "MARCspec", "MARC 21" ],
-    "homepage": "http://cklee.github.io/marc-spec/marc-spec.html",
     "authors": [
         {
             "name": "Carsten Klee",
@@ -14,6 +13,9 @@
     "require": {
         "php": ">=5.4.0"
     },
+    "require-dev": {
+         "phpunit/phpunit": "4.5.*"
+    },
     "autoload": {
         "psr-0": { "CK\\MARCspec": "" }
     },