# * Format of the rules is:

# [a1, a2, a3 ...[b1, b2, b3... [c1, c2, c3...]]]

# - The first level (a) defines which attributes are used to name the top level directory
# - The second level (b) defines which attributes are used to name the data files
# - The third level (c) defines which attributes are used as index keys

# * Rules can be grouped

# [a1, a2, a3 ...
#   [b1, b2, b3... [c1, c2, c3...]]
#   [B1, B2, B3... [C1, C2, C3...]]
# ]

# * A list of values can be given for an attribute
# [ ..., stream=enfo/efov, ... ]
# This will be used when matching rules.

# * Attributes can be typed
#   Globally, at the begining of this file:

#   refdate: Date;

#   or in the context of a rule:
#   [type=cl, ... [date:ClimateMonth, ...]]

# Typing attributes is done when the user's requests or the GRIB values need to be modified before directories, files and indexes are created. For example, ClimateMonth will transform 2010-04-01 to 'may' internally.

# * Attributes can be optional
# [ step, levelist?, param ]
# They will be replaced internally by an empty value. It is also posiible to provide a default subtitution value: e.g. [domain?g] will consider the domain to be 'g' if missing.

# * Attributes can be removed:
# [grid-]
# This is useful to remove attributes present in the GRIB that should not be ignored

# * Rules are matched:

# - If the attributes are present in the GRIB/Request, or marked optional or ignored
# - If a list of possible value is provided, one of them must match, for example
#   [ class, expver, stream=enfo/efov, date, time, domain ]
#   will match either stream=enfo or stream=efov, all other attributes will be matched if they exist in the GRIB or user's request

# * On archive:
# - Attributes are extracted from the GRIB (namespace 'mars'), possibly modified by the attribute type
# - Only the first rule is used, so order is important
# - All GRIB attributes must be used by the rules, otherwise an error is raised

# * On retrieve:
# - Attributes are extracted from the user's request, possibly modified by the attribute type (e.g. for handling of U/V)
# - All the matching rules are considered
# - Only attributes listed in the rules are used to extract values from the user's request


# Default types

param:      Param;
step:       Step;
date:       Date;
hdate:      Date;
refdate:    Date;
latitude:   Double;
longitude:  Double;
levelist:   Double;
grid:       Grid;
expver:     Expver;

time:       Time;
fcmonth:    Integer;

number:     Integer;
frequency:  Integer;
direction:  Integer;
channel:    Integer;

instrument: Integer;
ident:      Integer;

diagnostic: Integer;
iteration:  Integer;
system:     Integer;
method:     Integer;


########################################################
# These are the rules for the Climate DT

# clte/wave
[ class=d1, dataset=climate-dt, activity, experiment, generation, model, realization, expver, stream=clte/wave, date
       [ resolution, type, levtype
               [ time, levelist?, param, frequency?, direction? ]]
]

# clmn
[ class=d1, dataset=climate-dt, activity, experiment, generation, model, realization, expver, stream=clmn, year
       [ month, resolution, type, levtype
               [ levelist?, param ]]
]

########################################################
# These are the rules for the Extremes DT
# oper/wave/lwda/lwwv
[ class=d1, dataset=extremes-dt, expver, stream=oper/wave/lwda/lwwv, date, time
        [ resolution?, type, levtype
                [ step, levelist?, param, frequency?, direction? ]]
]
########################################################
# These are the rules for the On-Demand Extremes DT
# oper/wave
[ class=d1, dataset=on-demand-extremes-dt, expver, stream=oper/wave, date, time
        [ type, levtype
                [ step, levelist?, param, frequency?, direction? ]]
]
########################################################


########################################################
#
# These are the rules for rd
# oper/wave/lwda/lwwv
[ class=rd, expver, stream=oper/wave/lwda/lwwv/dcda/enfo, date, time, domain?
        [ type, levtype
                [ number?, step, levelist?, param, frequency?, direction? ]]
]

[ class=rd, expver, stream=mnth, domain?
       [ type, levtype
               [ date , time, step?, levelist?, param ]]
]