RETRIEVAL DEVICE, METHOD FOR CONTROLLING RETRIEVAL DEVICE, AND RECORDING MEDIUM

A search device receives a search request, extracts at least one of an alias or a metadata name from the search request, converts the alias to metadata name by referring to metadata schema management information for managing in an inclusive manner a namespace alias and a metadata name for the retrieval device to identify a metadata schema definition defining the structure of a retrieval-target file that includes metadata, and specifies a field name from the metadata name by referring to schema mapping management information for managing the corresponding relationship between a metadata name of metadata schema definition information and a field name of the retrieval index schema definition.