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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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