diff --git a/library/HTMLPurifier/AttrDef/Multiple.php b/library/HTMLPurifier/AttrDef/Multiple.php
new file mode 100644
index 00000000..4ffb1a66
--- /dev/null
+++ b/library/HTMLPurifier/AttrDef/Multiple.php
@@ -0,0 +1,36 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef.php';
+
+class HTMLPurifier_AttrDef_Multiple extends HTMLPurifier_AttrDef
+{
+    
+    var $single;
+    var $max;
+    
+    function HTMLPurifier_AttrDef_Multiple($single, $max = 4) {
+        $this->single = $single;
+        $this->max = $max;
+    }
+    
+    function validate($string, $config, &$context) {
+        $string = $this->parseCDATA($string);
+        if ($string === '') return false;
+        $parts = explode(' ', $string); // parseCDATA replaced \r, \t and \n
+        $length = count($parts);
+        $final = '';
+        for ($i = 0, $num = 0; $i < $length && $num < $this->max; $i++) {
+            if (ctype_space($parts[$i])) continue;
+            $result = $this->single->validate($parts[$i], $config, $context);
+            if ($result !== false) {
+                $final .= $result . ' ';
+                $num++;
+            }
+        }
+        if ($final === '') return false;
+        return rtrim($final);
+    }
+    
+}
+
+?>
\ No newline at end of file
diff --git a/tests/HTMLPurifier/AttrDef/MultipleTest.php b/tests/HTMLPurifier/AttrDef/MultipleTest.php
new file mode 100644
index 00000000..e5e6b986
--- /dev/null
+++ b/tests/HTMLPurifier/AttrDef/MultipleTest.php
@@ -0,0 +1,30 @@
+<?php
+
+require_once 'HTMLPurifier/AttrDef/Integer.php';
+require_once 'HTMLPurifier/AttrDef/Multiple.php';
+
+class HTMLPurifier_AttrDef_MultipleTest extends HTMLPurifier_AttrDefHarness
+{
+    
+    function test() {
+        $this->def = new HTMLPurifier_AttrDef_Multiple(
+            new HTMLPurifier_AttrDef_Integer()
+        );
+        
+        $this->assertDef('1 2 3 4');
+        $this->assertDef('6');
+        $this->assertDef('4 5');
+        $this->assertDef('  2  54 2 3', '2 54 2 3');
+        $this->assertDef("6\r3", '6 3');
+        
+        $this->assertDef('asdf', false);
+        $this->assertDef('a s d f', false);
+        $this->assertDef('1 2 3 4 5', '1 2 3 4');
+        $this->assertDef('1 2 invalid 3', '1 2 3');
+        
+        
+    }
+    
+}
+
+?>
\ No newline at end of file
diff --git a/tests/index.php b/tests/index.php
index 8aab3589..fda09381 100644
--- a/tests/index.php
+++ b/tests/index.php
@@ -70,6 +70,7 @@ $test_files[] = 'AttrDef/IntegerTest.php';
 $test_files[] = 'AttrDef/NumberTest.php';
 $test_files[] = 'AttrDef/CSSLengthTest.php';
 $test_files[] = 'AttrDef/PercentageTest.php';
+$test_files[] = 'AttrDef/MultipleTest.php';
 $test_files[] = 'IDAccumulatorTest.php';
 $test_files[] = 'TagTransformTest.php';
 $test_files[] = 'AttrTransform/LangTest.php';