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Published

May 9

vr.tr.may-9 · thing-q2556

Let an agent handle May 9 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 May 9 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 May 9 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 May 9, 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 May 9? 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

May 9, day 129 (day 130 in leap years) of the year in the Gregorian calendar, with 236 days remaining in both common and leap years. May 9 is Europe Day in the European Union, marking the Schuman Declaration of 1950, and Victory Day in Russia and several other former Soviet states, marking the end of the Second World War in Europe.

Why it exists Filled

Let an agent handle May 9 as a calendar date with weekday computation, observances attributed to their traditions and sourced events.

Distinguishing features Filled

  • The ninth day of May
  • 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

  • Use Victory Day commemorations to promote present-day wars or territorial claims.
  • Present Europe Day or Victory Day as observed everywhere.
  • Ignore the role or losses of any nation in the Second World War when describing the date.

Only with a human decision

  • Choosing how a public or commercial calendar presents May 9 in a region where its meaning is disputed.

May

  • State the position of May 9 in the year and how many days remain.
  • Report May 9 as both Europe Day and Victory Day, naming who keeps each.

Moral aspects Filled

  • May 9 commemorates millions of war dead and is used politically today.
  • The same date carries different meanings in the European Union and in post-Soviet states.

Who is affected

  • Veterans and their families
  • Communities in post-Soviet states
  • European citizens

Owners Filled

Steward

Nobody owns a calendar date; each observance is kept by the state or body that declared it.

Links to other meta-models Filled

parent

  • Q11188523 - registry parent class

related

  • May - month
  • May 8 - 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.may-9
  • Wikidata: Q2556 (https://www.wikidata.org/wiki/Q2556)
  • ISO 8601: --05-09 recurring date

Direct properties not applicable Not applicable

  • day of year: 129 or 130 day - common year, leap year where different
  • days remaining: 236 days

Plane XCT: no invented physical properties.

Recognition optional Filled

  • Written 9 May or May 9
  • ISO format --05-09
  • 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 Q2556: May 9 - identity and sense of the item
  2. Wikipedia: May 9 - 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-q2556/spec.json