← Back to catalogue
Published

September 11

vr.tr.september-11 · thing-q2851

Let an agent handle September 11 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Thing Registry Cross-cutting context XCT.TME
Bundle → Layer → Finding → QuestionsClassifiersWhat it isWhy it existsDistinguishing featuresWhat robots and AI may and may not doMoral aspectsOwnersLinks to other meta-modelsIdentity and identifiersDirect propertiesRecognitionCapabilities and actionsHazards and failure modesStandards and interfacesContext of useSources

Bundle → Layer → Finding → Questions Filled

4 bundles · 8 layers · 8 findings · 16 questions

Date Calendar facts.

Weekday

Computation.

Weekday

Weekday.

  1. On which weekday does September 11 fall in this year? measurement
  2. Is it a leap year? boundary

Calendar

Julian or Gregorian.

Calendar

Calendar system.

  1. Is the Julian or Gregorian calendar meant? boundary
  2. What is the equivalent date in the other calendar? measurement
Observances Holidays.

Holiday

Public holiday.

Holiday

Holiday status.

  1. Is September 11 a public holiday or observance here? provenance
  2. Which tradition or law sets it? provenance

Attribution

Traditions.

Attribution

Attributed observances.

  1. Which countries or communities observe something on this date, according to them? provenance
  2. Is the observance attributed rather than assumed? boundary
History Past events.

Events

On this day.

Events

Historical events.

  1. Which notable events happened on September 11, according to reliable sources? provenance
  2. Are dates given in the same calendar? boundary

Anniversaries

Recurring.

Anniversaries

Anniversaries.

  1. Which anniversaries fall on this date this year? provenance
  2. Which are round numbers? measurement
Planning Scheduling.

Countdown

Days until.

Countdown

Countdown.

  1. How many days until the next September 11? measurement
  2. From which date? definition

Work

Working day.

Work

Working day.

  1. Is it a working day for this organisation? provenance
  2. Do deadlines move? boundary

Classifiers Filled

Family
Thing Registry
Category
Cross-cutting context
Entry kind
thing
Plane
XCT
Domain
XCT.TME

What it is Filled

September 11, day 254 (day 255 in leap years) of the year in the Gregorian calendar, with 111 days remaining in both common and leap years. September 11 is the anniversary of the 2001 terrorist attacks in the United States, commemorated as Patriot Day, of the 1973 military coup in Chile that overthrew Salvador Allende, the National Day of Catalonia or Diada, and the Ethiopian New Year Enkutatash in most years.

Why it exists Filled

Let an agent handle September 11 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The eleventh day of September
  • Weekday varies by year
  • Observances vary by place
  • Julian and Gregorian dates differ by 13 days in this era

What robots and AI may and may not do Filled

Must not

  • Spread conspiracy theories about the 2001 attacks.
  • Blame Muslims or Arabs as groups for the attacks.
  • Present the 1973 coup in Chile or the Catalan question one-sidedly.
  • Use images of victims for engagement or promotion.

Only with a human decision

  • Scheduling public messages on a remembrance day for the dead.

May

  • List the observances and anniversaries of September 11 with their country and year.
  • Compute that it is day 254, or 255 in leap years.
  • Distinguish the 2001 attacks, the 1973 coup in Chile, the Diada and Enkutatash.

Moral aspects Filled

  • Several anniversaries on this date mark mass death and political violence.
  • The attacks were followed by prejudice against Muslims.

Who is affected

  • Families of victims
  • Muslim communities
  • Victims of the Chilean dictatorship

Owners Filled

Steward

Nobody owns a date; governments and communities declare the observances on it.

Links to other meta-models Filled

parent

  • Q11185228 - registry parent class

related

  • September - month
  • September 10 - date
  • calendar date - category
  • ISO 8601 - notation

What else AI and robots need to interact with it Filled

Identity and identifiers required Filled

  • Vercy registry: vr.tr.september-11
  • Wikidata: Q2851 (https://www.wikidata.org/wiki/Q2851)
  • ISO 8601: --09-11 recurring date

Direct properties not applicable Not applicable

  • day of year: 254 or 255 day - common year, leap year where different
  • days remaining: 111 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 11 September or September 11
  • ISO format --09-11
  • Observances vary by country and tradition
  • A date on calendars.

Capabilities and actions required Filled

  • compute its weekday in a given year
  • check local and international observances
  • find sourced historical events
  • schedule events

Hazards and failure modes required Filled

  • Assuming observances are universal
  • Unsourced on-this-day events
  • Mixing Julian and Gregorian dates

Standards and interfaces required Filled

  • ISO 8601
  • National public holiday laws

Context of use required Filled

  • A calendar date for scheduling, holidays and anniversaries.
  • the recurring calendar date
  • specific dated days in given years

Sources Filled

  1. Wikidata item Q2851: September 11 - identity and sense of the item
  2. Wikipedia: September 11 - general description of the item

Open questions

  • Should dated days be separate entries?
  • How should observances be linked?
  • How should events be sourced?

Machine files

Card as JSON Specification Card backlog vercy.card/1

Provenance

thing registry research (pass 2) · unreviewed

Built from: models/things/publications/thing-q2851/spec.json