diff --git a/src/XML/xenc11/AbstractXenc11Element.php b/src/XML/xenc11/AbstractXenc11Element.php
new file mode 100644
index 00000000..400b2db1
--- /dev/null
+++ b/src/XML/xenc11/AbstractXenc11Element.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\XMLSecurity\XML\xenc11;
+
+use SimpleSAML\XML\AbstractElement;
+use SimpleSAML\XMLSecurity\Constants as C;
+
+/**
+ * Abstract class to be implemented by all the classes in this namespace
+ *
+ * @package simplesamlphp/xml-security
+ */
+abstract class AbstractXencElement extends AbstractElement
+{
+    /** @var string */
+    public const NS = C::NS_XENC11;
+
+    /** @var string */
+    public const NS_PREFIX = 'xenc11';
+}