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diff --git a/src/extension/internal/template-base.h b/src/extension/internal/template-base.h
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+++ b/src/extension/internal/template-base.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * A base template generator used by internal template types.
+ *
+ * Authors:
+ *   Martin Owens <doctormo@geek-2.com>
+ *
+ * Copyright (C) 2022 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef EXTENSION_INTERNAL_TEMPLATE_BASE_H
+#define EXTENSION_INTERNAL_TEMPLATE_BASE_H
+
+#include <glib.h>
+
+#include "2geom/point.h"
+#include "extension/extension.h"
+#include "extension/implementation/implementation.h"
+#include "extension/system.h"
+#include "extension/template.h"
+#include "util/units.h"
+
+class SPDocument;
+class SPPage;
+
+namespace Inkscape {
+namespace Extension {
+namespace Internal {
+
+class TemplateBase : public Inkscape::Extension::Implementation::Implementation
+{
+public:
+    bool check(Inkscape::Extension::Extension *module) override { return true; };
+
+    SPDocument *new_from_template(Inkscape::Extension::Template *tmod) override;
+    void resize_to_template(Inkscape::Extension::Template *tmod, SPDocument *doc, SPPage *page) override;
+    bool match_template_size(Inkscape::Extension::Template *tmod, double width, double height) override;
+
+protected:
+    virtual Geom::Point get_template_size(Inkscape::Extension::Template *tmod) const;
+    virtual Geom::Point get_template_size(Inkscape::Extension::Template *tmod, const Util::Unit *unit) const;
+    virtual const Util::Unit *get_template_unit(Inkscape::Extension::Template *tmod) const;
+
+private:
+};
+
+} // namespace Internal
+} // namespace Extension
+} // namespace Inkscape
+#endif /* EXTENSION_INTERNAL_TEMPLATE_BASE_H */