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==171 CODED DATA FIELDCoded data field: COLLECTION MANAGEMENTCollection management==
This field contains coded data applicable to all types of holdings records, that indicates the extent and
the consultation and retention policy of the described unit.
==Occurrence==
Mandatory. Not repeatable.
==Indicators==
Indicator 1: blank (not defined)
Indicator 2: blank (not defined)
==Subfields==
==Notes on Field Contents==
'''$a/0 General retention policy'''
# =
Other
'''$a/1 Availability'''
#
Other
'''$a/2-4 Specific retention policy'''
Three character positions that indicate the specific parts of the item that are retained when field
### No specific retention
'''$a/2 Policy type'''
a =
Indicates that the latest time or part unit is retained (including the current issue).
'''$a/3 Number of units'''
Contains a one-character number (1-9) that specifies the number of time or part units that are
number does not include the current time or part unit.
'''$a/4 Time or part units'''
a
value used for single -part unit.
'''$a/6-8 Number of copies reported'''
Three character positions that indicate the number of copies reported. Right justified with zero
fill.
=Related Field==
302 NOTES PERTAINING TO CODED INFORMATIONNotes pertaining to coded information
==Examples==
''EX 1''
171 '''<nowiki>##$adba3a#001</nowiki>'''
Item available ($a/1 = b), with limited retention ($a/0 = d) that consists of the previous ($a/2
retention ($a/5 = #), the information is reported to 1 copy ($a/6-8 = 001).
''EX 2''
171 '''<nowiki>##$afb###x001</nowiki>'''
Item not retained ($a/0 = f), available ($a/1 = b) without specific retention ($a/2-4 = <nowiki>###</nowiki>),
used for a single -part unit ($a/5 = x), the information is reported to 1 copy ($a/6-8 = 001).