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1.1     ! root        1: .th INTRODUCTION ERROR 3/30/81
        !             2: .sh NAME
        !             3: Error messages introduction
        !             4: .sh DESCRIPTION
        !             5: This document describes the error returns which are possible from the
        !             6: \*(II data base system and gives an explanation of the probable reason
        !             7: for their occurrence.
        !             8: In all cases the errors are
        !             9: numbered
        !            10: .it nxxx
        !            11: where
        !            12: .it n
        !            13: indicates the source of
        !            14: the error,
        !            15: according to the following table:
        !            16: .s3
        !            17: .nf
        !            18:        1 =  \s-2EQUEL\s0 preprocessor
        !            19:        2 =  parser
        !            20:        3 =  query modification
        !            21:        4 =  decomposition and one variable query processor
        !            22:        5 =  data base utilities
        !            23:        30 = \s-2GEO-QUEL\s0 errors
        !            24: .s3
        !            25: .fi
        !            26: For a description of these routines the reader is referred to
        !            27: .it "The Design and Implementation of \*(II."
        !            28: The
        !            29: .it xxx
        !            30: in an error number is an
        !            31: arbitrary identifier.
        !            32: .s3
        !            33: The error messages
        !            34: are stored in the file
        !            35: .bd \&.../files/error7_\c
        !            36: .it n,
        !            37: where
        !            38: .it n
        !            39: is defined as above.
        !            40: The format of these files
        !            41: is the error number,
        !            42: a tab character,
        !            43: the message to be printed,
        !            44: and the tilde character (``~'')
        !            45: to delimit the message.
        !            46: .s3
        !            47: In addition many error messages have ``%\c
        !            48: .it i\c
        !            49: \&''
        !            50: in their body
        !            51: where
        !            52: .it i
        !            53: is a digit
        !            54: interpreted as an offset
        !            55: into a list of parameters
        !            56: returned by the source of the error.
        !            57: This indicates
        !            58: that a parameter will be inserted by the error handler into the error
        !            59: return.
        !            60: In most cases this parameter will be self explanatory in meaning.
        !            61: .s3
        !            62: Where the error message is thought to be completely self explanatory, no
        !            63: additional description is provided.

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