Property talk:P2840

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NSC number
numeric identifier for substances submitted to the National Cancer Institute (NCI) for testing and evaluation

Associated item	National Cancer Institute (Q664846)
Data type	External identifier
Domain	According to this template: chemical compound According to statements in the property: chemical compound (Q11173), mixture (Q169336) or group of chemical entities (Q55640599) When possible, data should only be stored as statements
Allowed values	\d+
Example	sparfosic acid (Q10851798) → 224131 hexaamminecobalt(III) nitrate (Q16326579) → 1300 triphenyl lead chloride (Q21099511) → 12104
Source	https://dtp.cancer.gov/databases_tools/bulk_data.htm
Formatter URL	https://dtp.cancer.gov/dtpstandard/servlet/dwindex?searchtype=NSC&chemnameboolean=and&outputformat=html&searchlist=$1&Submit=Submit
Related to country	United States of America (Q30) (See 762 others)
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/P2840 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 116,124 Main statement 116,121 >99.9% of uses Qualifier 3 <0.1% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Format “[1-9]\d{0,5}”: value must be formatted using this pattern (PCRE syntax). (Help)

List of violations of this constraint: Database reports/Constraint violations/P2840#Format, hourly updated report, SPARQL

Distinct values: this property likely contains a value that is different from all other items. (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/P2840#Unique value, SPARQL (every item), SPARQL (by value)

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).
List of violations of this constraint: Database reports/Constraint violations/P2840#Single value, SPARQL

Type “chemical compound (Q11173), mixture (Q169336), group of chemical entities (Q55640599)”: item must contain property “instance of (P31), subclass of (P279)” with classes “chemical compound (Q11173), mixture (Q169336), group of chemical entities (Q55640599)” or their subclasses (defined using subclass of (P279)). (Help)

List of violations of this constraint: Database reports/Constraint violations/P2840#Type Q11173, Q169336, Q55640599, hourly updated report, 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/P2840#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/P2840#Scope, SPARQL

Single-value constraint

It seems that this constraint is not valid as there are many exceptions to it. I tried to list them using exception to constraint (P2303), but it makes no sense. As for now I'm changing this constraint to suggestion constraint (Q62026391). Wostr (talk) 07:02, 7 February 2022 (UTC)