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diff --git a/source/blender/io/usd/intern/usd_writer_abstract.h b/source/blender/io/usd/intern/usd_writer_abstract.h
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+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2019 Blender Foundation.
+ * All rights reserved.
+ */
+#ifndef __USD_WRITER_ABSTRACT_H__
+#define __USD_WRITER_ABSTRACT_H__
+
+#include "usd_exporter_context.h"
+#include "abstract_hierarchy_iterator.h"
+
+#include <pxr/usd/sdf/path.h>
+#include <pxr/usd/usd/stage.h>
+#include <pxr/usd/usdShade/material.h>
+#include <pxr/usd/usdUtils/sparseValueWriter.h>
+
+#include <vector>
+
+extern "C" {
+#include "DEG_depsgraph_query.h"
+#include "DNA_material_types.h"
+}
+
+struct Material;
+struct Object;
+
+namespace USD {
+
+class USDAbstractWriter : public AbstractHierarchyWriter {
+ protected:
+  const USDExporterContext usd_export_context_;
+  pxr::UsdUtilsSparseValueWriter usd_value_writer_;
+
+  bool frame_has_been_written_;
+  bool is_animated_;
+
+ public:
+  USDAbstractWriter(const USDExporterContext &usd_export_context);
+  virtual ~USDAbstractWriter();
+
+  virtual void write(HierarchyContext &context) override;
+
+  /* Returns true if the data to be written is actually supported. This would, for example, allow a
+   * hypothetical camera writer accept a perspective camera but reject an orthogonal one.
+   *
+   * Returning false from a transform writer will prevent the object and all its decendants from
+   * being exported. Returning false from a data writer (object data, hair, or particles) will
+   * only prevent that data from being written (and thus cause the object to be exported as an
+   * Empty). */
+  virtual bool is_supported(const HierarchyContext *context) const;
+
+  const pxr::SdfPath &usd_path() const;
+
+ protected:
+  virtual void do_write(HierarchyContext &context) = 0;
+  virtual bool check_is_animated(const HierarchyContext &context) const;
+  pxr::UsdTimeCode get_export_time_code() const;
+
+  pxr::UsdShadeMaterial ensure_usd_material(Material *material);
+};
+
+}  // namespace USD
+
+#endif /* __USD_WRITER_ABSTRACT_H__ */