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diff --git a/include/ppaml/tracer/internal.h b/include/ppaml/tracer/internal.h
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+/* ppaml/tracer/internal.h -- definitions of abstract types
+ * Copyright (C) 2013  Galois, Inc.
+ *
+ * This library 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 3 of the License, or (at your option)
+ * any later version.
+ *
+ * This library 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 library.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * To contact Galois, complete the Web form at
+ * <http://corp.galois.com/contact/> or write to Galois, Inc., 421 Southwest
+ * 6th Avenue, Suite 300, Portland, Oregon, 97204-1622. */
+
+/**
+ * @file internal.h
+ * Definitions of abstract types.
+ *
+ * @warning Do not include this file directly.  Instead, include @ref
+ * ppaml/tracer.h.
+ *
+ * This file contains the implementations of abstract types which, for
+ * efficiency reasons, are exposed to the user.
+ */
+
+/* THIS FILE SHOULD NOT BE #INCLUDED DIRECTLY.  Instead, #include
+ * <ppaml/tracer.h>. */
+
+#ifndef PPAML_TRACER_INTERNAL_H
+#define PPAML_TRACER_INTERNAL_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <otf.h>
+
+/**
+ * @struct ppaml_tracer_t ppaml/tracer/internal.h ppaml/tracer.h
+ * Tracer state bundle.
+ *
+ * ppamltracer is fundamentally a set of stateful operations; this struct holds
+ * the state ppamltracer needs to operate properly.
+ *
+ * To increase flexibility, ppamltracer users may allocate instances of this
+ * struct on the stack or heap.
+ *
+ * Newly-allocated instances of ppaml_tracer_t are invalid and must be
+ * initialized using @ref ppaml_tracer_init before they can be used.  Once a
+ * ppaml_tracer_t is no longer required, it must be finalized using @ref
+ * ppaml_tracer_done.
+ */
+typedef struct {
+	/// @private The underlying Open Trace Format file manager.
+        OTF_FileManager *manager;
+	/// @private The underlying Open Trace Format output subsystem.
+        OTF_Writer *writer;
+} ppaml_tracer_t;
+
+/**
+ * `sizeof(`@ref ppaml_tracer_t`)`.
+ *
+ * @warning This constant is intended for interfacing with other languages.  It
+ * is not part of the stable ppamltracer C API.  Use
+ * `sizeof(`@ref ppaml_tracer_t`)` instead.
+ */
+const size_t ppaml_tracer_t_size;
+
+/**
+ * @struct ppaml_phase_t ppaml/tracer/internal.h ppaml/tracer.h
+ * A phase of execution to trace.
+ *
+ * A ppaml_phase_t represents a phase of execution about which the user wishes
+ * to gather timing statistics.
+ *
+ * To increase flexibility, ppamltracer users may allocate instances of this
+ * struct on the stack or heap.
+ *
+ * Newly-allocated instances of ppaml_phase_t are invalid and must be
+ * initialized using @ref ppaml_phase_init before they can be used.  Once a
+ * ppaml_phase_t is no longer required, it must be finalized using @ref
+ * ppaml_phase_done.
+ */
+typedef struct {
+	/// @private The associated ppaml_tracer_t.
+        ppaml_tracer_t *tracer;
+	/**
+	 * @private
+	 * The Open Trace Format identifier for this phase.
+	 *
+	 * Phases are isomorphic to functions as understood by the Open Trace
+	 * Format libraries; thus, this is a "function identifier".
+	 */
+	uint32_t otf_function_id;
+} ppaml_phase_t;
+
+/**
+ * `sizeof(`@ref ppaml_phase_t`)`.
+ *
+ * @warning This constant is intended for interfacing with other languages.  It
+ * is not part of the stable ppamltracer C API.  Use
+ * `sizeof(`@ref ppaml_phase_t`)` instead.
+ */
+const size_t ppaml_phase_t_size;
+
+#endif