+/** @class KDMError
+ * @brief A problem with a KDM.
+ */
+class KDMError : public StringError
+{
+public:
+ KDMError (std::string s)
+ : StringError (s)
+ {}
+};
+
+/** @class PixelFormatError
+ * @brief A problem with an unsupported pixel format.
+ */