Here is a list of all namespaces with brief descriptions:

Mdc_args
Mdc_calendar
Mdc_calendar_generic
Mdc_calendar_internal
Mdc_calendar_types
Mdc_date
Mdc_date_generic
Mdc_date_internal
Mdc_date_types
Mdc_error
Mdc_hash
Mdc_iounit
Mdc_regex	シンプルな正規表現関数 'match' を提供します．
Mdc_scaledsec
Mdc_types	種別型パラメタを提供します。
Mdc_units
Mdc_url
Mdc_utils
Mdcunits_com
Mgt4_history
Mgt4f90io
Mgtdata_internal_map
Mgtdata_internal_vartable
Mgtdata_netcdf_file_generic
Mgtdata_netcdf_file_internal
Mgtdata_netcdf_file_types
Mgtdata_netcdf_generic
Mgtdata_netcdf_internal
Mgtdata_netcdf_types
Mgtdata_types
Mgtool5
Mgtool_history
Mgtool_history_nmlinfo
Mgtool_history_nmlinfo_generic
Mgtool_history_nmlinfo_internal
Mgtool_history_nmlinfo_types
Mgtool_history_types
Mgtool_historyauto
Msysdep