--- /dev/null
+<?php
+/*
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\Common\Persistence;
+
+/**
+ * Interface for proxy classes.
+ *
+ * @author Roman Borschel <roman@code-factory.org>
+ * @since 2.2
+ */
+interface Proxy
+{
+ /**
+ * Marker for Proxy class names.
+ *
+ * @var string
+ */
+ const MARKER = '__CG__';
+
+ /**
+ * Length of the proxy marker.
+ *
+ * @var integer
+ */
+ const MARKER_LENGTH = 6;
+
+ /**
+ * Initializes this proxy if its not yet initialized.
+ *
+ * Acts as a no-op if already initialized.
+ *
+ * @return void
+ */
+ public function __load();
+
+ /**
+ * Returns whether this proxy is initialized or not.
+ *
+ * @return bool
+ */
+ public function __isInitialized();
+}