Property talk:P9350

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PeriodO period ID
identifier for a period in the PeriodO time period gazetteer

Associated item	PeriodO (Q104904881)
Applicable "stated in" value	PeriodO (Q104904881)
Data type	External identifier
Domain	spatio-temporal entity (Q58415929), historical period (Q11514315), temporal entity (Q26907166), occurrence (Q1190554) or time interval (Q186081)
Allowed values	[a-z0-9]{9}
Example	Eoarchean (Q731470) → 9qtgwckcw (RDF) Black Death (Q42005) → pgmrbmd5t (RDF) Korean War (Q8663) → 6c6g3gspp (RDF) Cultural Revolution (Q8690) → 6c6g3bsbt (RDF) Spain under the Restoration (Q1044536) → 6c6g3gks2 (RDF) Safavid dynasty (Q161205) → 6c6g35q9w (RDF) Victorian era (Q182688) → kh9dsxp46 (RDF) Cretaceous (Q44626) → 9qtgwjxcm (RDF) Early Cretaceous (Q752187) → 9qtgwjphz (RDF) Middle Kingdom of Egypt (Q191324) → 6c6g3fz6m (RDF)
Source	https://perio.do
Formatter URL	http://n2t.net/ark:/99152/p0$1
See also	Joconde time period ID (P7885), FOIH periods ID (P4306)
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/P9350 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 109 Main statement 99 out of 6,847 (1% complete) 90.8% of uses Qualifier 10 9.2% of uses
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Explanations [Edit]

PeriodO is a public domain gazetteer of scholarly definitions of historical, art-historical, and archaeological periods.

The way PeriodO individuates periods differs from how Wikidata individuates periods. What PeriodO is identifying are periods as conceptualized by different people or organizations. The criteria for individuating periods in PeriodO are threefold:

1. temporal extent,
2. spatial extent, and
3. source.

Hence there are many “Bronze Age” periods, both because this period is understood as having different temporal extents at different places on Earth, and because even at the same spatial location, opinions about the temporal extent of “Bronze Age” may vary.

Even if two sources agree on both the temporal extent and spatial extent of a period (as in the case of zj6g8ks9s Bronze Age and r8d9c53w3 Bronzealder), PeriodO still records them as separate records, because it is important to know when two different sources agree, as well as when they disagree. Note also that, so that the genealogy of period concepts can be traced, PeriodO records some periods as specifically derived from earlier-defined periods (as in the case of qhb66wrbs Bronze Age, which is derived from zj6g8ks9s Bronze Age).

Given these differences between how PeriodO treats periods (as individual concepts originating from particular sources) and how Wikidata tends to treat periods (as broad consensus terms), the following should be kept in mind when using PeriodO period ID (P9350):

1. PeriodO period ID (P9350) should not be used on broad terms like “Bronze Age” that do not specify any particular spatial extent (and hence cannot really specify a temporal extent either, only a relative temporal position).
2. For Wikidata entities that are located both in time and in space, it is possible for PeriodO period ID (P9350) to have multiple values. (Thus PeriodO period ID (P9350) is a subclass of Wikidata property for an identifier that generally has just one value, but rarely can have two or more values for the same entity (Q99566538).) Having multiple values for this property indicates that there are differing views on the spatial and/or temporal extent of the entity in question.

Format “[a-z0-9]{9}”: 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).
List of violations of this constraint: Database reports/Constraint violations/P9350#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/P9350#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/P9350#Scope, SPARQL

Type “spatio-temporal entity (Q58415929), historical period (Q11514315), temporal entity (Q26907166), occurrence (Q1190554), time interval (Q186081)”: item must contain property “instance of (P31), subclass of (P279)” with classes “spatio-temporal entity (Q58415929), historical period (Q11514315), temporal entity (Q26907166), occurrence (Q1190554), time interval (Q186081)” or their subclasses (defined using subclass of (P279)). (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/P9350#Type Q58415929, Q11514315, Q26907166, Q1190554, Q186081, SPARQL