Property talk:P1819

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genealogics.org person ID
identifier for a person at genealogics.org. Format: "I" followed by 8 digits

Description	Genealogics.org is a genealogy database by Leo van de Pas containing over half a million persons (source) built during 25 years. Please read this interesting explanation.
Associated item	Genealogics (Q19847326)
Applicable "stated in" value	Genealogics (Q19847326)
Data type	External identifier
Domain	human (Q5)
Allowed values	I\d{8} (string starting with 'I' followed by 8 digits)
Example	Charlemagne (Q3044) → I00000001 William the Conqueror (Q37594) → I00000002 Leo van de Pas (Q19847329) → I00071584 Nicolaes Tulp (Q630646) → I00077116 John Thelwall (Q99198871) → I00737968
Formatter URL	https://www.genealogics.org/getperson.php?personID=$1&tree=LEO
See also	WikiTree person ID (P2949), FamilySearch person ID (P2889), Roglo person ID (P7929)
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 Map of people by place values: place of birth educated at work location residence place of death place of burial January 1st dates People with date of birth on January 1 People with date of death on January 1 People with both dates on January 1 Mix'n'match (Report) Database reports/Complex constraint violations/P1819 Database reports/Humans with missing claims/P1819 Database reports/Constraint violations/P1819 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 292,916 Main statement 269,153 out of 725,642 (37% complete) 91.9% of uses Qualifier 5 <0.1% of uses Reference 23,758 8.1% of uses
Search for values

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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/P1819#Single value, 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/P1819#Unique value, SPARQL (every item), SPARQL (by value)

Format “I\d{8}”: value must be formatted using this pattern (PCRE syntax). (Help)

List of violations of this constraint: Database reports/Constraint violations/P1819#Format, hourly updated report, SPARQL

Type “human (Q5)”: item must contain property “instance of (P31)” with classes “human (Q5)” or their subclasses (defined using subclass of (P279)). (Help)

List of violations of this constraint: Database reports/Constraint violations/P1819#Type Q5, hourly updated report, SPARQL

Item “sex or gender (P21)”: Items with this property should also have “sex or gender (P21)”. (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/P1819#Item P21, search, SPARQL

Item “date of birth (P569)”: Items with this property should also have “date of birth (P569)”. (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/P1819#Item P569, SPARQL

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

List of violations of this constraint: Database reports/Constraint violations/P1819#Scope, 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/P1819#Entity types

pipes in label
list of labels to fix (Help)
Violations query: SELECT ?item ?l WHERE { ?item wdt:P1819 []; rdfs:label ?l. FILTER( lang(?l) ="en" && REGEX(?l,"\\\u007C") ) } LIMIT 50
List of this constraint violations: Database reports/Complex constraint violations/P1819#pipes in label

Statistics

P1819 on values

Property	Values with P1819	Values without P1819	%without
spouse (P26) ⇔	78418	25769	24.7	w wo symmetric
father (P22)	123997	12651	9.3	w wo
mother (P25)	103391	13569	11.6	w wo
child (P40)	175187	89108	33.7	w wo
sibling (P3373)	22378	16046	41.8	w wo symmetric
relative (P1038)	2094	2143	50.6	w wo
unmarried partner (P451)	1003	824	45.1	w wo symmetric
stepparent (P3448)	145	129	47.1	w wo

Compare at Wikidata:WikiProject_Genealogy#Identifiers_on_values

Discussion

Errors in database

• Q75765430: Incorrect parents
• Q75764696: father Jonathan, grandfather John
• Q75580969 (I00539339): Incorrect parents
• Q96215963: father is not Joseph, but his brother John
• Q96288511/Q96288510: a generation is missing between
• Q96223217: Incorrect mother

item-requires-statement constraint (Q21503247)

Records without a recognisable date of birth (P569):

• https://www.genealogics.org/getperson.php?personID=I00553424&tree=LEO

--HarryNº2 (talk) 18:07, 20 May 2023 (UTC)