21 namespace metadata  namespace
24 using Metadata = std::string;  typedef
32 /** @brief Build error associations specific to metadata. Specialize this
33  *         template for handling a specific type of metadata.
34  *  @tparam M - type of metadata
35  *  @param [in] match - metadata to be handled
36  *  @param [in] data - metadata key=value entries
44 // for this metadata.
58     auto metadata = util::additional_data::parse(data);  in build()  local
59     auto iter = metadata.find(match);  in build()
60     if (metadata.end() != iter)  in build()
98 } // namespace metadata