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diff --git a/constants/page_object.h b/constants/page_object.h
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+++ b/constants/page_object.h
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+// Copyright 2018 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONSTANTS_PAGE_OBJECT_H_
+#define CONSTANTS_PAGE_OBJECT_H_
+
+namespace pdfium {
+namespace page_object {
+
+// PDF 1.7 spec, table 3.27.
+// Entries in a page object.
+
+constexpr char kType[] = "Type";
+constexpr char kParent[] = "Parent";
+constexpr char kResources[] = "Resources";
+constexpr char kMediaBox[] = "MediaBox";
+constexpr char kCropBox[] = "CropBox";
+constexpr char kArtBox[] = "ArtBox";
+constexpr char kContents[] = "Contents";
+constexpr char kRotate[] = "Rotate";
+
+}  // namespace page_object
+}  // namespace pdfium
+
+#endif  // CONSTANTS_PAGE_OBJECT_H_