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diff --git a/src/xml/document.h b/src/xml/document.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ *  Interface for XML documents
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2011 Authors
+ * Copyright 2005 MenTaLguY <mental@rydia.net>
+ * 
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_INKSCAPE_XML_SP_REPR_DOC_H
+#define SEEN_INKSCAPE_XML_SP_REPR_DOC_H
+
+#include "xml/node.h"
+
+namespace Inkscape {
+namespace XML {
+
+/**
+ * @brief Interface for XML documents
+ *
+ * This class represents a complete document tree. You have to go through this class
+ * to create new nodes. It also contains transaction support, which forms the base
+ * of the undo system.
+ *
+ * The document is also a node. It usually contains only two child nodes - a processing
+ * instruction node (PINode) containing the XML prolog, and the root node. You can get
+ * the root node of the document by calling the root() method.
+ *
+ * The name "transaction" can be misleading, because they are not atomic. Their main feature
+ * is that they provide rollback. After starting a transaction,
+ * all changes made to the document are stored in an internal event log. At any time
+ * after starting the transaction, you can call the rollback() method, which restores
+ * the document to the state it was before starting the transaction. Calling the commit()
+ * method causes the internal event log to be discarded, and you can establish a new
+ * "restore point" by calling beginTransaction() again. There can be only one active
+ * transaction at a time for a given document.
+ */
+struct Document : virtual public Node {
+public:
+    /**
+     * @name Document transactions
+     * @{
+     */
+    /**
+     * @brief Checks whether there is an active transaction for this document
+     * @return true if there's an established transaction for this document, false otherwise
+     */
+    virtual bool inTransaction()=0;
+    /**
+     * @brief Begin a transaction and start recording changes
+     *
+     * By calling this method you effectively establish a resotre point.
+     * You can undo all changes made to the document after this call using rollback().
+     */
+    virtual void beginTransaction()=0;
+    /**
+     * @brief Restore the state of the document prior to the transaction
+     *
+     * This method applies the inverses of all recorded changes in reverse order,
+     * restoring the document state from before the transaction. For some implementations,
+     * this function may do nothing.
+     */
+    virtual void rollback()=0;
+    /**
+     * @brief Commit a transaction and discard change data
+     *
+     * This method finishes the active transaction and discards the recorded changes.
+     */
+    virtual void commit()=0;
+    /**
+     * @brief Commit a transaction and store the events for later use
+     *
+     * This method finishes a transaction and returns an event chain
+     * that describes the changes made to the document. This method may return NULL,
+     * which means that the document implementation doesn't support event logging,
+     * or that no changes were made.
+     *
+     * @return Event chain describing the changes, or NULL
+     */
+    virtual Event *commitUndoable()=0;
+    /*@}*/
+
+    /**
+     * @name Create new nodes
+     * @{
+     */
+    virtual Node *createElement(char const *name)=0;
+    virtual Node *createTextNode(char const *content)=0;
+    virtual Node *createTextNode(char const *content, bool is_CData)=0;
+    virtual Node *createComment(char const *content)=0;
+    virtual Node *createPI(char const *target, char const *content)=0;
+    /*@}*/
+
+    /**
+     * @brief Get the event logger for this document
+     *
+     * This is an implementation detail that should not be used outside of node implementations.
+     * It should be made non-public in the future.
+     */
+    virtual NodeObserver *logger()=0;
+};
+
+}
+}
+
+#endif
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :