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diff --git a/internal/xmpmeta/xml/deserializer_impl.h b/internal/xmpmeta/xml/deserializer_impl.h
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+++ b/internal/xmpmeta/xml/deserializer_impl.h
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+#ifndef DYNAMIC_DEPTH_INTERNAL_XMPMETA_XML_DESERIALIZER_IMPL_H_  // NOLINT
+#define DYNAMIC_DEPTH_INTERNAL_XMPMETA_XML_DESERIALIZER_IMPL_H_  // NOLINT
+
+#include <libxml/tree.h>
+
+#include <map>
+#include <mutex>  // NOLINT(build/c++11)
+#include <string>
+
+#include "base/port.h"
+#include "xmpmeta/xml/deserializer.h"
+
+namespace photos_editing_formats {
+namespace xml {
+
+// Deserializes an XML node.
+// Example:
+//   xmlNodePtr device_node =
+//       DepthFirstSearch(xmp.ExtendedSection(), "Device", "Description");
+//   DeserializerImpl deserializer(device_node);
+//   string revision;
+//   deserializer.ParseString("Device", "Revision", &revision);
+// TODO(miraleung): Add example for list node deserializer.
+class DeserializerImpl : public Deserializer {
+ public:
+  // Creates a deserializer with a null rdf:Seq node.
+  explicit DeserializerImpl(const xmlNodePtr node);
+
+  // Returns a Deserializer.
+  // If prefix is empty, the deserializer will be created on the first node
+  // found with a name that matches child_name.
+  // child_name is the name of the next node to deserialize.
+  std::unique_ptr<Deserializer> CreateDeserializer(
+      const string& prefix, const string& child_name) const override;
+
+  // Returns a Deserializer from a list element node, if one is available as
+  // a descendant of node_.
+  // If prefix is empty, the deserializer will be created on the first node
+  // found with a name that matches child_name.
+  // Returns null if seq_node_ is null or if the index is out of range.
+  std::unique_ptr<Deserializer> CreateDeserializerFromListElementAt(
+      const string& prefix, const string& list_name, int index) const override;
+
+  // Parsers for XML properties.
+  // If prefix is empty, the node's namespace may be null. Otherwise, it must
+  // not be null.
+  bool ParseBase64(const string& prefix, const string& name,
+                   string* value) const override;
+  bool ParseIntArrayBase64(const string& prefix, const string& name,
+                           std::vector<int>* values) const override;
+  bool ParseFloatArrayBase64(const string& prefix, const string& name,
+                             std::vector<float>* values) const override;
+  bool ParseDoubleArrayBase64(const string& prefix, const string& name,
+                              std::vector<double>* values) const override;
+  bool ParseBoolean(const string& prefix, const string& name,
+                    bool* value) const override;
+  bool ParseDouble(const string& prefix, const string& name,
+                   double* value) const override;
+  bool ParseInt(const string& prefix, const string& name,
+                int* value) const override;
+  bool ParseFloat(const string& prefix, const string& name,
+                  float* value) const override;
+  bool ParseLong(const string& prefix, const string& name,
+                 int64* value) const override;
+  bool ParseString(const string& prefix, const string& name,
+                   string* value) const override;
+
+  // Parses the numbers in an rdf:Seq list into the values collection.
+  // The given collection is cleared of any existing values, and the
+  // parsed numbers are written to it.
+  bool ParseIntArray(const string& prefix, const string& list_name,
+                     std::vector<int>* values) const override;
+  bool ParseDoubleArray(const string& prefix, const string& list_name,
+                        std::vector<double>* values) const override;
+
+  // Disallow copying.
+  DeserializerImpl(const DeserializerImpl&) = delete;
+  void operator=(const DeserializerImpl&) = delete;
+
+ private:
+  xmlNodePtr node_;
+  // Remembers the parent node of the last deserializer created on the rdf:Seq
+  // node. For performance reasons only, to avoid unnessarily traversing
+  // the XML document tree.
+  mutable xmlNodePtr list_node_;
+  // Lock modifications of list_node_ in const functions to make it thread-safe.
+  mutable std::mutex mtx_;
+};
+
+}  // namespace xml
+}  // namespace photos_editing_formats
+
+#endif // DYNAMIC_DEPTH_INTERNAL_XMPMETA_XML_DESERIALIZER_IMPL_H_  // NOLINT