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diff --git a/src/xml/node-fns.h b/src/xml/node-fns.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * @brief Helper functions for XML nodes
+ *//*
+ * Authors:
+ *   see git history
+ *   Unknown author
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com> (documentation)
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_XML_NODE_FNS_H
+#define SEEN_XML_NODE_FNS_H
+
+#include "xml/node.h"
+
+namespace Inkscape {
+namespace XML {
+
+bool id_permitted(Node const *node);
+
+//@{
+/**
+ * @brief Get the next node in sibling order
+ * @param node The origin node
+ * @return The next node in sibling order
+ * @relates Inkscape::XML::Node
+ */
+inline Node *next_node(Node *node) {
+    return ( node ? node->next() : nullptr );
+}
+inline Node const *next_node(Node const *node) {
+    return ( node ? node->next() : nullptr );
+}
+//@}
+
+//@{
+/**
+ * @brief Get the previous node in sibling order
+ *
+ * This method, unlike Node::next(), is a linear search over the children of @c node's parent.
+ * The return value is NULL when the node has no parent or is first in the sibling order.
+ *
+ * @param node The origin node
+ * @return The previous node in sibling order, or NULL
+ * @relates Inkscape::XML::Node
+ */
+Node *previous_node(Node *node);
+inline Node const *previous_node(Node const *node) {
+    return previous_node(const_cast<Node *>(node));
+}
+//@}
+
+//@{
+/**
+ * @brief Get the node's parent
+ * @param node The origin node
+ * @return The node's parent
+ * @relates Inkscape::XML::Node
+ */
+inline Node *parent_node(Node *node) {
+    return ( node ? node->parent() : nullptr );
+}
+inline Node const *parent_node(Node const *node) {
+    return ( node ? node->parent() : nullptr );
+}
+//@}
+
+}
+}
+
+#endif /* !SEEN_XML_NODE_FNS_H */
+/*
+  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 :