1 files changed, 34 insertions, 0 deletions
diff --git a/internal/dynamic_depth/element.h b/internal/dynamic_depth/element.h
new file mode 100644
index 0000000..e68829d
--- /dev/null
+++ b/internal/dynamic_depth/element.h
@@ -0,0 +1,34 @@
+#ifndef DYNAMIC_DEPTH_INTERNAL_DYNAMIC_DEPTH_ELEMENT_H_  // NOLINT
+#define DYNAMIC_DEPTH_INTERNAL_DYNAMIC_DEPTH_ELEMENT_H_  // NOLINT
+
+#include <unordered_map>
+
+#include "xmpmeta/xml/deserializer.h"
+#include "xmpmeta/xml/serializer.h"
+
+namespace photos_editing_formats {
+namespace dynamic_depth {
+
+/**
+ * An interface for an element in the Dynamic Depth spec.
+ */
+class Element {
+ public:
+  virtual ~Element() {}
+
+  // Appends child elements' namespaces' and their respective hrefs to the
+  // given collection, and any parent nodes' names to prefix_names.
+  // Key: Name of the namespace.
+  // Value: Full namespace URL.
+  // Example: ("Image", "http://ns.google.com/photos/dd/1.0/image/")
+  virtual void GetNamespaces(
+      std::unordered_map<string, string>* ns_name_href_map) = 0;
+
+  // Serializes this element.
+  virtual bool Serialize(xml::Serializer* serializer) const = 0;
+};
+
+}  // namespace dynamic_depth
+}  // namespace photos_editing_formats
+
+#endif // DYNAMIC_DEPTH_INTERNAL_DYNAMIC_DEPTH_ELEMENT_H_  // NOLINT