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+.. _qml-extension-objects-example:
+
+Extending QML - Extension Objects Example
+=========================================
+
+This example builds on the the :ref:`qml-adding-types-example`.
+
+Shows how to use QmlExtended decorator to provide an extension object to a
+QLineEdit without modifying or subclassing it.
+
+Firstly, the LineEditExtension class is registered with the QML system as an
+extension of QLineEdit. We declare a foreign type to do this as we cannot
+modify Qt's internal QLineEdit class.
+
+.. code-block:: python
+
+    @QmlNamedElement("QLineEdit")
+    @QmlExtended(LineEditExtension)
+    @QmlForeign(QLineEdit)
+    class LineEditForeign(QObject):
+
+
+Note the usage of ``QmlNamedElement()`` instead of ``QmlElement()``.
+``QmlElement()`` uses the name of the containing type by default,
+``LineEditExtension`` in this case. As the class being an extension class is
+an implementation detail, we choose the more natural name ``QLineEdit``
+instead.
+
+The QML engine then instantiates a QLineEdit.
+
+In QML, a property is set on the line edit that only exists in the
+``LineEditExtension`` class:
+
+.. code-block:: javascript
+
+    QLineEdit {
+        left_margin: 20
+    }
+
+The extension type performs calls on the ``QLineEdit`` that otherwise will not
+be accessible to the QML engine.