765  Synthesized Number Components (R)
MARC 21 Classification  Concise
2008
Information about how a synthesized number or a portion of a synthesized number was
built. It traces the different components of a synthesized number, showing the different
portions of the number and where the add instructions are given. If a number was built
using two or more instructions, a separate field 765 is given for each instruction.
The information in this field is primarily intended to serve as a tracing of how
classification numbers are synthesized to assist classifiers. It facilitates computer
manipulation of synthesized numbers, both for validation that the numbers have been
synthesized correctly and for indexbuilding, to allow searching every use of a specific
number.
Indicators
First  Field of number analyzed
0  153 field
1  Other field
Second  Undefined
#  Undefined
Subfield Codes
$a  Number where instructions are foundsingle number or beginning number of span (R)
$b  Base number (R)
Base classification number to which one or more other numbers are added. In many
instances it may be the same as subfield $a. When two or more additions
are used to build one number, the base number for the second and following 765
fields is the number resulting from the immediately preceding addition.
$c  Classification numberending number of span (R)
$f  Facet designator (R)
Extra character(s) to be added to classification numbers that indicate facets.
$r  Root number (R)
Initial digits of the pattern number or span when these digits are not added. If
this subfield is present, subfield $s or $t must also be
present to specify the digits that are added.
$s  Digits added from classification number in schedule or external table (R)
$t  Digits added from internal subarrangement or add table (R)
$u  Number being analyzed (R)
Repeated when the same 765 field is applicable to more than one number appearing
in the same record. If the number being analyzed is in field 153 (Classification
Number), indicated by value 0 in the first indicator, this subfield need not be
used unless both numbers in a classification number span are being analyzed.
$v  Number in internal subarrangement or add table where instructions are found (R)
$w  Table identificationInternal subarrangement or add table (R)
$y  Table sequence number for internal subarrangement or add table (R)
$z  Table identification (R)
$8  Field link and sequence number (R)
Examples










765 
0#$b362.196994$a616.9942$c616.9949$r611$s2

765 
0#$b346.046$a346.046$r333$s95

765 
0#$b346.04695$a333.7$w333.7$t16

765 
0#$b372.1$a372.11$c372.18$r371$s1

765 
0#$b372.11$a371.1008$c371.1009$f0$z1$s092

765 
1#$b787.2$a784$c788$w784$c788$t1$u787.219369

765 
1#$b787.21$a784$c788$v18$c19$r784.1$s9369$u787.219369

765 
0#$b255.9$a255.91$c255.97$r271.9$s1$u255.91

765 
0#$b255.9$a255.91$c255.97$r271.9$s7$u255.97

765 
1#$b255.9$a255.91$c255.97$r271.9$s72$u255.972$u255.97200941$u255.97206

765 
1#$b255.972$a255.1$c255.7$f0$z1$s09$u255.97200941

765 
1#$b255.972009$z1$a093$c099$z2$s41$u255.97200941

765 
1#$b255.972$a255.1$c255.7$w255.1$c255.7$t06$u255.97206
