##############################################################################
#
#                        DDL Data Name Descriptions
#                        --------------------------
#
# _compliance           The dictionary version in which the item is defined.
#
# _definition           The description of the item.
#
# _enumeration          A permissible value for an item. The value 'unknown'
#                       signals that the item can have any value.
#
# _enumeration_default  The default value for an item if it is not specified
#                       explicitly. 'unknown' means the default is not known.
#
# _enumeration_detail   The description of a permissible value for an item.
#                       Note that the code '.' normally signals a null
#                       or 'not applicable' condition.
#
# _enumeration_range    The range of values for a numerical item. The
#                       construction is 'min:max'. If 'max' is omitted then the 
#                       item can have any value greater than or equal to 'min'.
#
# _esd                  Signals whether an estimated standard deviation is 
#                       expected to be appended (enclosed within brackets)
#                       to a numerical item. May be 'yes' or 'no'.
#
# _esd_default          The default value for the esd of a numerical item
#                       if a value is not appended.
#
# _example              An example of the item.
#
# _example_detail       A description of the example.
#
# _list                 Signals whether an item is expected to occur in a looped
#                       list. Possible values: 'yes','no' or 'both'.
#
# _list_identifier      Identifies a data item that MUST appear in the list
#                       containing the currently defined data item.
#
# _name                 The data name of the item defined.
#
# _type                 The data type 'numb' or 'char' (latter includes 'text').
#
# _units_extension      The data-name extension code used to specify the units 
#                       of a numerical item.
#
# _units_description    A description of the units.
#
# _units_conversion     The method of converting the item into a value based
#                       on the default units. Each conversion number is 
#                       preceded by an operator code *, /, +, or - which 
#                       indicates how the conversion number is applied.
#
# _update_history       A record of the changes to this file.
#
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