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→3.2 Levels of Holdings Statements
==3.2 Levels of Holdings Statements==
According to the guidelines for applying [https://www.iso.org/standard/18372.html ISO 10324 : 1997 ''Information and documentation –Holdings statements – summary level''], the holdings statement can have 3 levels:
'''Level 1 holdings'''
:Level 1 identifies the item and the holding institution. This level is sufficient for single -part items, but gives no indication of extent of holdings for multipart items and continuing resources items.
:Report the institution identifier for each bibliographic item, regardless of retention policy or completeness of holdings. Minimally, it consists of an item identifier for the bibliographic item for which holdings are recorded and a location identifier. The item identifier may be contained in field [[hold/004|004 Related bibliographic record identifier]]. The location identifier is contained in subfield [[hold/252#a|$a Institution identifier]] of field [[hold/252|252 Location and call number]]. '''Levels 2 and 3 holdings'''
:Level 2 adds to le vel 1 general guidance as to the extent of an institution's holdings. Minimally, in addition to the requirements for level 1, it could include:
::Receipt or acquisition status ([[hold/170 |170]] $a/0)::General retention policy ([[hold/171|171 ]] $a/0)::Completeness designator ([[hold/171|171 ]] $a/5)
Level 3 includes a statement of summary extent of holdings.
:1. Determine the basic bibliographic unit(s) and the secondary bibliographic unit(s) for the bibliographic item.
:2. Determine whether each unit is continuing resources, multipart or single -part.
:3. Report general holdings (level 2) or extent of holdings (level 3) for each unit as indicated under the description of the data elements.
level of enumeration and chronology, in one or more of the following holdings data fields:
*[[hold/500|500 Caption and patterns – basic bibliographic unit]]*[[hold/501|501 Caption and patterns – secondary bibliographic unit supplementary materials]]*[[hold/502|502 Caption and patterns – secondary bibliographic unit indexes]]
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*[[hold/510|510 Enumeration and chronology - basic bibliographic unit]]*[[hold/511|511 Enumeration and chronology - secondary bibliographic unit: supplementary materials]]*512 Enumeration and chronology - secondary bibliographic unit: indexes]]
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*[[hold/520|520 Textual holdings - basic bibliographic unit]]*[[hold/521|521 Textual holdings - secondary bibliographic unit: supplementary materials]]*[[hold/522|522 Textual holdings - secondary bibliographic unit: indexes]]
The following are examples of bibliographic items and their corresponding units in the ISO standard: