Property talk:P1149

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Library of Congress Classification
subject classification number used in the Library of Congress Classification system; does not include the shelflisting portion assigned to individual publications

Description	a system of library classification developed by the Library of Congress.
Applicable "stated in" value	Library of Congress Classification (Q621080)
Data type	External identifier
Domain	class, book (note: this should be moved to the property statements)
Allowed values	[A-Z]{1,3}(\d+(\.\d+)?( *\.[A-Z]{0,3}\d+([ -]\.?[A-Z]{0,3}\d+)?)?( *\d+[a-z]*)?)?-?([A-Z]{1,3}(\d+(\.\d+)?( *\.[A-Z]{0,3}\d+([ -]\.?[A-Z]{0,3}\d+)?)?( *\d+[a-z]*)?)?)?
Example	social science (Q34749) → H (RDF) Library of Congress Classification (Q621080) → Z696.U4-Z696.U7 (RDF) Augustine of Hippo (Q8018) → BR1720.A9 (RDF)
Source	Library of Congress Classification PDF Files Library of Congress Classification Outline Library of Congress Classification Approved Lists Scheme Members
Formatter URL	https://id.loc.gov/authorities/classification/$1 https://catalog.loc.gov/vwebv/search?searchArg=$1&searchCode=CALL%2B&searchType=1
Tracking: usage	Category:Pages using Wikidata property P1149 (Q26697453)
See also	Dewey Decimal Classification (P1036), Library of Congress authority ID (P244), Basisklassifikation (P5748), Regensburg Classification (P1150), Colon Classification (P8248), Library of Congress Classification (works and editions) (P8360)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other external identifier Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Database reports/Constraint violations/P1149 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 3,761 Main statement 3,355 89.2% of uses Qualifier 3 <0.1% of uses Reference 403 10.7% of uses
Search for values

[create Create a translatable help page (preferably in English) for this property to be included here]

Single value: this property generally contains a single value. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). Known exceptions: sample book (Q102700083), horror play (Q103319035), zebra (Q32789), desert (Q8514), rainforest ecology (Q105441712), bird anatomy (Q136352), fossil amphibian (Q106099235), fossil reptile (Q106099256), fossil fish (Q106112742), koala (Q36101), decision support system (Q330268), Semantic Web (Q54837), organic semiconductor (Q1933714)
List of violations of this constraint: Database reports/Constraint violations/P1149#Single value, SPARQL

Format “[A-Z]{1,3}(\d+(\.\d+)?( *\.[A-Z]{0,3}\d+([ -]\.?[A-Z]{0,3}\d+)?)?( *\d+[a-z]*)?)?-?([A-Z]{1,3}(\d+(\.\d+)?( *\.[A-Z]{0,3}\d+([ -]\.?[A-Z]{0,3}\d+)?)?( *\d+[a-z]*)?)?)?”: value must be formatted using this pattern (PCRE syntax). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). Known exceptions: Library of Congress Subject Headings (Q1823134), Library of Congress Classification (Q621080), freemasonry (Q41726), settlement house (Q101224664), metropolitan area (Q1907114), American Civil War (Q8676), music education (Q27908), New York City (Q60), microbiology (Q7193), public university (Q875538), private university (Q902104), Baltimore (Q5092), library catalog (Q856638), United States Supreme Court justice (Q20706330), Moscow (Q649), Nottinghamshire (Q23092), legal information system (Q56679069), geographic information system (Q483130), town hall (Q25550691)
List of violations of this constraint: Database reports/Constraint violations/P1149#Format, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P1149#Entity types

Scope is as main value (Q54828448), as reference (Q54828450): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P1149#Scope, SPARQL

Qualifiers “applies to part (P518), object has role (P3831), subject named as (P1810), reason for deprecated rank (P2241), reason for preferred rank (P7452), identity of subject in context (P4649), nature of statement (P5102), applies to jurisdiction (P1001)”: this property should be used only with the listed qualifiers. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P1149#allowed qualifiers, SPARQL

This property is being used by: tl:Padron:Infobox book/Wikidata en:Template:Infobox book, en:Template:Infobox book/wikidata, en:Template:Infobox book/Wikidata/Filtered, en:Template:Infobox library classification kab:Talɣa:Infobox adlis sr:Шаблон:Infokutija Knjiga-lat, sr:Шаблон:Инфокутија Књига fa:الگو:Infobox book/wikidata, fa:الگو:Infobox book, fa:الگو:Infobox book/تمرین tg:Шаблон:Infobox book/wikidata, tg:Шаблон:Асар/wikidata ca:Plantilla:Infotaula de llibre, ca:Plantilla:Infotaula llibre sco:Template:Infobox beuk sq:Stampa:Infobox book uk:Шаблон:Картка книги bh:टेम्पलेट:Infobox book ml:ഫലകം:Infobox book ne:ढाँचा:Infobox book ms:Templat:Infobox buku, ms:Templat:Kotak info buku pt:Predefinição:Info/Livro/Wikidata te:మూస:Book, te:మూస:Infobox book simple:Template:Infobox book el:Πρότυπο:Πληροφορίες βιβλίου sat:ᱪᱷᱟᱸᱪ:Infobox book azb:شابلون:Infobox book, azb:شابلون:Infobox library classification th:แม่แบบ:กล่องข้อมูล หนังสือ id:Templat:Infobox library classification, id:Templat:Infobox book/wikidata bn:টেমপ্লেট:তথ্যছক বই ga:Teimpléad:WD Bosca Sonraí Leabhar ban:Mal:Infobox library classification vec:Modeło:Infobox de Libro pa:ਫਰਮਾ:Infobox book/Wikidata/Filtered Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)

Source for these letter codes

The source for the classes and their letters is here: Library of Congress Classification Outline. Danrok (talk) 20:37, 18 February 2014 (UTC)

The identifier only starts with a letter but it also contains numbers. Example: City planning (Q69883) = HT165.5-169.9. --Kolja21 (talk) 20:57, 18 February 2014 (UTC)

Single value constraint

The single value constraint on this is wrong. Books have multiple LOC classifications all the time. Sometimes libraries get multiple copies of popular books just so they can file them under multiple numbers. --Ssd (talk) 16:36, 19 January 2019 (UTC)

Can confirm. An example is 74-80703 for Cyborg IV (Q5197893), which has PZ4.C133 Cz $a PS3553.A38 (which I entered as PZ4.C133 and PS3553.A38. --Pokechu22 (talk) 19:30, 22 October 2020 (UTC)

• This is a particular case unique to children's literature. Children's lit is classed by LC in PZ, but some libraries choose to file their children's fiction with the main collection of authors, so LC provided the alternative classification number PS3553.A38. Another common situation is whether to class bibliographies in Z or in the class number specific to the main subject. For example, a bibliography on bears would be classed in Z7996.B43 by LC, but many libraries choose to class it with all other works on bears at QL737.C27. UWashPrincipalCataloger (talk) 18:42, 23 October 2020 (UTC)

But what if a book describes how Augustine of Hippo (Q8018) was attacked by a bear or raised a bear? Vladimir Alexiev (talk) 02:03, 11 December 2020 (UTC)

• ? I'm not sure what you are asking? Such a book would only class in one number, a number for biography of Augustine of Hippo. It would not ever be classed under bears, if that is what you are asking? This is not the same situation as a work such as literature that could be classed in one place for adults, and in a different place for children. Or under a subject number or under a Z bibliography numbers. Those are the most common situations where something can have two or more valid LC classification numbers. UWashPrincipalCataloger (talk) 02:01, 12 December 2020 (UTC)

Regex constraints

I made the constraint laxer. The previous one was incorrect, even a simple case like BJ1-1725 was not recognised. Nemo 18:06, 6 November 2019 (UTC)

This valid range of numbers is getting a format constraint warning: KM1-KM999. I've used it in Asian law (Q100709157). It is a valid range: https://id.loc.gov/authorities/classification/KM1-KM999.html I tried giving it as KM1-999, but that does not resolve in id.loc.gov. Can someone please review the Regex constraint and revise it so that this range is accepted? UWashPrincipalCataloger (talk) 20:00, 21 October 2020 (UTC)

I haven't seen an answer to this and have another item that I'd like to add a range to. The LC subject authority record for Cave churches (cave church (Q64732764)) gives two separate LC classifications: 1) NA4910 (Church architecture: General) and 2) NA5201-NA6113 (By country). How can I record the range NA5201-NA6113 in the item? UWashPrincipalCataloger (talk) 00:39, 25 November 2020 (UTC)

Range of numbers

One used to be able to record a range of numbers and now when one attempts to, it won't even allow one to input such a range. There needs to be a means to record ranges, since there often is not a single LC classification number that corresponds to a topic, but a range instead. For example, if you look at the LC subject authority record for Peramelemorphia (Q244587) at http://id.loc.gov/authorities/subjects/sh99010660, you will see that a range of numbers is given as QL737.M47-QL737.M476. If you look at the authority for happiness (Q8) at http://id.loc.gov/authorities/subjects/sh85058807, there are three different numbers given, one of which is a range: BJ1480-BJ1486.5. These should be able to be recorded in Wikidata. UWashPrincipalCataloger (talk) 18:55, 27 January 2021 (UTC)

This continues not to work properly. Another example that does not work: http://id.loc.gov/authorities/classification/QE851-QE853. This represents a range of numbers. When I try to include QE851-QE853 as the value of this property in fossil fish (Q106112742), it only allows QE851. It should allow QE851-QE853, and link to http://id.loc.gov/authorities/classification/QE851-QE853. UWashPrincipalCataloger (talk) 17:41, 22 March 2021 (UTC)

As a further example: https://id.loc.gov/authorities/sh85038036 has two values QC20.7.D55 and TA347.D5. Senator2029 18:08, 17 May 2022 (UTC)

I have updated the regular expression to work with ranges. Hopefully it should work now or soon (I think the regexes for external IDs can take some time to update). Middle river exports (talk) 00:29, 11 September 2022 (UTC)

Why is NAMED AS not allowed as qualifier?

Why is subject named as (P1810) not allowed as a qualifier? Often, the LC Classification is slightly different than the LCSH or Name Authority. Senator2029 19:33, 5 January 2022 (UTC)

I have updated the allowed qualifiers constraints to include this and some related generic qualifiers that are useful for identifiers. I also removed the to-be-deprecated "of" qualifier. I think this is one of those things where nobody got around to it rather than something purposefully omitted. Middle river exports (talk) 00:32, 11 September 2022 (UTC)