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diff --git a/src/attribute-rel-util.h b/src/attribute-rel-util.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2016 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+#ifndef __SP_ATTRIBUTE_REL_UTIL_H__
+#define __SP_ATTRIBUTE_REL_UTIL_H__
+
+/*
+ * attribute-rel-util.h
+ *
+ *  Created on: Sep 8, 2011
+ *      Author: tavmjong
+ */
+
+#include <glibmm/ustring.h>
+#include "xml/sp-css-attr.h"
+
+using Inkscape::XML::Node;
+
+/**
+ * Utility functions for cleaning XML tree.
+ */
+
+/**
+ * Enum for preferences
+ */
+enum SPAttrClean {
+  SP_ATTRCLEAN_ATTR_WARN      =  1,
+  SP_ATTRCLEAN_ATTR_REMOVE    =  2,
+  SP_ATTRCLEAN_STYLE_WARN     =  4,
+  SP_ATTRCLEAN_STYLE_REMOVE   =  8,
+  SP_ATTRCLEAN_DEFAULT_WARN   = 16,
+  SP_ATTRCLEAN_DEFAULT_REMOVE = 32
+};
+
+/**
+ * Get preferences
+ */
+unsigned int sp_attribute_clean_get_prefs();
+
+/**
+ * Remove or warn about inappropriate attributes and useless style properties.
+ * repr: the root node in a document or any other node.
+ */
+void sp_attribute_clean_tree(Node *repr);
+
+/**
+ * Recursively clean.
+ * repr: the root node in a document or any other node.
+ * pref_attr, pref_style, pref_defaults: ignore, delete, or warn.
+ */
+void sp_attribute_clean_recursive(Node *repr, unsigned int flags);
+
+/**
+ * Clean one element (attributes and style properties).
+ */
+void sp_attribute_clean_element(Node *repr, unsigned int flags);
+
+/**
+ * Clean style properties for one element.
+ */
+void sp_attribute_clean_style(Node *repr, unsigned int flags);
+
+/**
+ * Clean style properties for one style string.
+ */
+Glib::ustring sp_attribute_clean_style(Node *repr, gchar const *string, unsigned int flags);
+
+/**
+ * Clean style properties for one CSS.
+ */
+void sp_attribute_clean_style(Node* repr, SPCSSAttr *css, unsigned int flags);
+
+/**
+ * Remove CSS style properties with default values.
+ */
+void sp_attribute_purge_default_style(SPCSSAttr *css, unsigned int flags);
+
+/**
+ * Check one attribute on an element
+ */
+bool sp_attribute_check_attribute(Glib::ustring element, Glib::ustring id, Glib::ustring attribute, bool warn);
+
+#endif /* __SP_ATTRIBUTE_REL_UTIL_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 :