Additional metadata for datasets #629

dangotbanned · 2024-11-24T18:58:43Z

Note

Originally posted by @dangotbanned in vega/altair#3631 (comment)
I thought this would be easier to discuss in a new issue over here

Let me know if there is anything you need from the vega-daatsets repo side. Would it make sense for some logic to live there so that it gets updated if we add a new datasets for example?

@domoritz right now the additional metadata I'm adding is described above, and a preview of metadata.parquet is in vega/altair#3631 (comment)

I'm not too concerned about the logic for this living in altair.
The only static part is ext_supported - which is somewhat altair/python-specific:

 Extension: TypeAlias = Literal[".csv", ".json", ".tsv", ".arrow", ".parquet"] 
 EXTENSION_SUFFIXES = (".csv", ".json", ".tsv", ".arrow", ".parquet") 
  
  
 def is_ext_read(suffix: Any) -> TypeIs[Extension]: 
     return suffix in {".csv", ".json", ".tsv", ".arrow", ".parquet"}

For the current datasets, this is pretty much just to avoid .png.
Maybe that could just be a tabular flag?

I think we could benefit from other kinds of metadata that may be less trivial to work out on our end:

Is spatial (comment)
- Also if it factors into reading the file - (Geo|Topo)JSON
Schema/datatypes/columns
- Depending on outcome of (comment) - format string(s)

The text was updated successfully, but these errors were encountered:

domoritz · 2024-11-25T02:46:40Z

I'm not following. What is the enhancement you are asking for this repo? Should we provide a file with additional metadata about the datasets? Maybe a json? I'm not sure what would be in that file that would be generic enough so that the file shouldn't live in Altair.

dsmedia · 2024-11-25T03:12:32Z

I'm not following. What is the enhancement you are asking for this repo? Should we provide a file with additional metadata about the datasets? Maybe a json? I'm not sure what would be in that file that would be generic enough so that the file shouldn't live in Altair.

I'm wondering if sources.md could still be helpful here.

As background, we're making steady progress in cataloging the remaining undocumented datasets in this repo's sources.md file. Once those are done, it probably would make sense to reformat that file into a more standard style such that each dataset had, at a minimum, clearly defined details about column names, column types, licensing, a generation script path (if available), etc. Best efforts would be made to keep this metadata up to date when datasets were significantly modified or if new datasets were added.

Just thinking out loud, but instead of directly maintaining the sources.md file, we could keep the dataset metadata in a json or yaml file, and generate the sources.md file from this machine-readable format. We could consider writing the file to follow a standardized format like Frictionless Data Package. I could see a case that such a process would be beneficial to this repo even separate from the issue raised. And if such a machine-readable file helped to make it easier for downstream to work with these datasets, then perhaps all the better?

domoritz · 2024-11-25T04:19:53Z

I helped with some early versions of frictionless data packages. That may be a good fit.

dangotbanned · 2024-11-25T10:41:55Z

#629 (comment)

@dsmedia yeah this seems like exactly the kind of standardized format that would be helpful for us.

I did mention SOURCES.md in the description of vega/altair#3631
But decided to pause the work on parsing that, since something like your suggestion would be more maintainable.

I'm happy to help contribute towards the goal of a migrating the contents of SOURCES.md into some other format 🤝

Edit

Reading through the Frictionless Data Package standard; it seems like the perfect fit to me.

https://framework.frictionlessdata.io/docs/console/overview.html

dangotbanned · 2024-11-25T17:26:00Z

I've played around with frictionless a bit today.

Using just the defaults on the CLI managed to produce some fairly useful metadata.

Essentially just did this for each of .csv, .json, .tsv, .png, .parquet:

>>> frictionless describe data/*.json --yaml > json-out.yaml

Seems like the .json files will need some more work, but overall seems promising.

Inferred output

resources:
  - name: airports
    type: table
    path: airports.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: iata
          type: string
        - name: name
          type: string
        - name: city
          type: string
        - name: state
          type: string
        - name: country
          type: string
        - name: latitude
          type: number
        - name: longitude
          type: number
  - name: birdstrikes
    type: table
    path: birdstrikes.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: Airport Name
          type: string
        - name: Aircraft Make Model
          type: string
        - name: Effect Amount of damage
          type: string
        - name: Flight Date
          type: date
        - name: Aircraft Airline Operator
          type: string
        - name: Origin State
          type: string
        - name: Phase of flight
          type: string
        - name: Wildlife Size
          type: string
        - name: Wildlife Species
          type: string
        - name: Time of day
          type: string
        - name: Cost Other
          type: integer
        - name: Cost Repair
          type: integer
        - name: Cost Total $
          type: integer
        - name: Speed IAS in knots
          type: integer
  - name: co2-concentration
    type: table
    path: co2-concentration.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: Date
          type: date
        - name: CO2
          type: number
        - name: adjusted CO2
          type: number
  - name: disasters
    type: table
    path: disasters.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: Entity
          type: string
        - name: Year
          type: integer
        - name: Deaths
          type: integer
  - name: flights-airport
    type: table
    path: flights-airport.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: origin
          type: string
        - name: destination
          type: string
        - name: count
          type: integer
  - name: gapminder-health-income
    type: table
    path: gapminder-health-income.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: country
          type: string
        - name: income
          type: integer
        - name: health
          type: number
        - name: population
          type: integer
        - name: region
          type: string
  - name: github
    type: table
    path: github.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: time
          type: string
        - name: count
          type: integer
  - name: global-temp
    type: table
    path: global-temp.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: year
          type: integer
        - name: temp
          type: number
  - name: iowa-electricity
    type: table
    path: iowa-electricity.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: year
          type: date
        - name: source
          type: string
        - name: net_generation
          type: integer
  - name: la-riots
    type: table
    path: la-riots.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: first_name
          type: string
        - name: last_name
          type: string
        - name: age
          type: integer
        - name: gender
          type: string
        - name: race
          type: string
        - name: death_date
          type: date
        - name: address
          type: string
        - name: neighborhood
          type: string
        - name: type
          type: string
        - name: longitude
          type: number
        - name: latitude
          type: number
  - name: lookup_groups
    type: table
    path: lookup_groups.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: group
          type: integer
        - name: person
          type: string
  - name: lookup_people
    type: table
    path: lookup_people.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: name
          type: string
        - name: age
          type: integer
        - name: height
          type: integer
  - name: population_engineers_hurricanes
    type: table
    path: population_engineers_hurricanes.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: state
          type: string
        - name: id
          type: integer
        - name: population
          type: integer
        - name: engineers
          type: number
        - name: hurricanes
          type: integer
  - name: seattle-weather-hourly-normals
    type: table
    path: seattle-weather-hourly-normals.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: date
          type: datetime
        - name: pressure
          type: number
        - name: temperature
          type: number
        - name: wind
          type: number
  - name: seattle-weather
    type: table
    path: seattle-weather.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: date
          type: date
        - name: precipitation
          type: number
        - name: temp_max
          type: number
        - name: temp_min
          type: number
        - name: wind
          type: number
        - name: weather
          type: string
  - name: sp500-2000
    type: table
    path: sp500-2000.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: date
          type: date
        - name: open
          type: number
        - name: high
          type: number
        - name: low
          type: number
        - name: close
          type: number
        - name: adjclose
          type: number
        - name: volume
          type: integer
  - name: sp500
    type: table
    path: sp500.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: date
          type: string
        - name: price
          type: number
  - name: stocks
    type: table
    path: stocks.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: symbol
          type: string
        - name: date
          type: string
        - name: price
          type: number
  - name: us-employment
    type: table
    path: us-employment.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: month
          type: date
        - name: nonfarm
          type: integer
        - name: private
          type: integer
        - name: goods_producing
          type: integer
        - name: service_providing
          type: integer
        - name: private_service_providing
          type: integer
        - name: mining_and_logging
          type: integer
        - name: construction
          type: integer
        - name: manufacturing
          type: integer
        - name: durable_goods
          type: integer
        - name: nondurable_goods
          type: integer
        - name: trade_transportation_utilties
          type: integer
        - name: wholesale_trade
          type: number
        - name: retail_trade
          type: number
        - name: transportation_and_warehousing
          type: number
        - name: utilities
          type: number
        - name: information
          type: integer
        - name: financial_activities
          type: integer
        - name: professional_and_business_services
          type: integer
        - name: education_and_health_services
          type: integer
        - name: leisure_and_hospitality
          type: integer
        - name: other_services
          type: integer
        - name: government
          type: integer
        - name: nonfarm_change
          type: integer
  - name: weather
    type: table
    path: weather.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: location
          type: string
        - name: date
          type: date
        - name: precipitation
          type: number
        - name: temp_max
          type: number
        - name: temp_min
          type: number
        - name: wind
          type: number
        - name: weather
          type: string
  - name: windvectors
    type: table
    path: windvectors.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: longitude
          type: number
        - name: latitude
          type: number
        - name: dir
          type: integer
        - name: dirCat
          type: integer
        - name: speed
          type: number
  - name: zipcodes
    type: table
    path: zipcodes.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: zip_code
          type: integer
        - name: latitude
          type: number
        - name: longitude
          type: number
        - name: city
          type: string
        - name: state
          type: string
        - name: county
          type: string
  - name: annual-precip
    type: json
    path: annual-precip.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: anscombe
    type: json
    path: anscombe.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: barley
    type: json
    path: barley.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: budget
    type: json
    path: budget.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: budgets
    type: json
    path: budgets.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: burtin
    type: json
    path: burtin.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: cars
    type: json
    path: cars.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: countries
    type: json
    path: countries.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: crimea
    type: json
    path: crimea.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: driving
    type: json
    path: driving.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: earthquakes
    type: json
    path: earthquakes.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: flare-dependencies
    type: json
    path: flare-dependencies.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: flare
    type: json
    path: flare.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: flights-10k
    type: json
    path: flights-10k.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: flights-200k
    type: json
    path: flights-200k.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: flights-20k
    type: json
    path: flights-20k.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: flights-2k
    type: json
    path: flights-2k.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: flights-5k
    type: json
    path: flights-5k.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: football
    type: json
    path: football.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: gapminder
    type: json
    path: gapminder.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: income
    type: json
    path: income.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: jobs
    type: json
    path: jobs.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: londonboroughs
    type: json
    path: londonBoroughs.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: londoncentroids
    type: json
    path: londonCentroids.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: londontubelines
    type: json
    path: londonTubeLines.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: miserables
    type: json
    path: miserables.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: monarchs
    type: json
    path: monarchs.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: movies
    type: json
    path: movies.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: normal-2d
    type: json
    path: normal-2d.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: obesity
    type: json
    path: obesity.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: ohlc
    type: json
    path: ohlc.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: penguins
    type: json
    path: penguins.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: platformer-terrain
    type: json
    path: platformer-terrain.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: points
    type: json
    path: points.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: political-contributions
    type: json
    path: political-contributions.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: population
    type: json
    path: population.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: udistrict
    type: json
    path: udistrict.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: unemployment-across-industries
    type: json
    path: unemployment-across-industries.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: uniform-2d
    type: json
    path: uniform-2d.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: us-10m
    type: json
    path: us-10m.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: us-state-capitals
    type: json
    path: us-state-capitals.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: volcano
    type: json
    path: volcano.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: weather
    type: json
    path: weather.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: wheat
    type: json
    path: wheat.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: world-110m
    type: json
    path: world-110m.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: flights-3m
    type: table
    path: flights-3m.parquet
    scheme: file
    format: parquet
    mediatype: application/parquet
    schema:
      fields:
        - name: date
          type: integer
        - name: delay
          type: integer
        - name: distance
          type: integer
        - name: origin
          type: string
        - name: destination
          type: string
  - name: 7zip
    type: file
    path: 7zip.png
    scheme: file
    format: png
    mediatype: image/png
    encoding: utf-8
  - name: ffox
    type: file
    path: ffox.png
    scheme: file
    format: png
    mediatype: image/png
    encoding: utf-8
  - name: gimp
    type: file
    path: gimp.png
    scheme: file
    format: png
    mediatype: image/png
    encoding: utf-8
  - name: unemployment
    type: table
    path: unemployment.tsv
    scheme: file
    format: tsv
    mediatype: text/tsv
    encoding: utf-8
    dialect:
      csv:
        delimiter: "\t"
    schema:
      fields:
        - name: id
          type: integer
        - name: rate
          type: number

@dsmedia have you used this package in the past?

domoritz · 2024-11-26T16:34:36Z

Oh nice. Yeah, I would love to have a more machine readable format for the datasets here. Too bad the cli doesn't deal that well with JSON files.

domoritz · 2024-11-26T16:39:43Z

I filed frictionlessdata/frictionless-py#1712 to get JSON support. May be easier to contribute that than to create the schemas by hand here probably.

dangotbanned · 2024-11-26T17:45:15Z

I filed frictionlessdata/frictionless-py#1712 to get JSON support. May be easier to contribute that than to create the schemas by hand here probably.

Oh @domoritz thanks for opening the issue!
I figured out most of the JSON parts using the library (instead of the CLI).

I'll post the updated .yaml soon

dangotbanned · 2024-11-26T18:35:23Z

@domoritz as promised in (#629 (comment))

Updated .yaml (1538 lines)

name: vega-datasets
description: Common repository for example datasets used by Vega related projects.
homepage: http://github.com/vega/vega-datasets.git
licenses:
  - name: BSD-3-Clause
    path: https://opensource.org/license/bsd-3-clause
    title: The 3-Clause BSD License
sources:
  - path: https://github.com/vega/vega-datasets/blob/next/SOURCES.md
contributors:
  - title: UW Interactive Data Lab
    path: http://idl.cs.washington.edu
version: 2.11.0
created: '2024-11-26T18:27:32.207598+00:00'
resources:
  - name: 7zip
    type: file
    path: 7zip.png
    scheme: file
    format: png
    mediatype: image/png
    encoding: utf-8
  - name: airports
    type: table
    path: airports.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: iata
          type: string
        - name: name
          type: string
        - name: city
          type: string
        - name: state
          type: string
        - name: country
          type: string
        - name: latitude
          type: number
        - name: longitude
          type: number
  - name: annual-precip
    type: json
    path: annual-precip.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: anscombe
    type: table
    path: anscombe.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: Series
          type: string
        - name: X
          type: integer
        - name: Y
          type: number
  - name: barley
    type: table
    path: barley.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: yield
          type: number
        - name: variety
          type: string
        - name: year
          type: integer
        - name: site
          type: string
  - name: birdstrikes
    type: table
    path: birdstrikes.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: Airport Name
          type: string
        - name: Aircraft Make Model
          type: string
        - name: Effect Amount of damage
          type: string
        - name: Flight Date
          type: date
        - name: Aircraft Airline Operator
          type: string
        - name: Origin State
          type: string
        - name: Phase of flight
          type: string
        - name: Wildlife Size
          type: string
        - name: Wildlife Species
          type: string
        - name: Time of day
          type: string
        - name: Cost Other
          type: integer
        - name: Cost Repair
          type: integer
        - name: Cost Total $
          type: integer
        - name: Speed IAS in knots
          type: integer
  - name: budget
    type: table
    path: budget.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: Source Category Code
          type: integer
        - name: Source category name
          type: string
        - name: Source subcategory
          type: integer
        - name: Source subcategory name
          type: string
        - name: Agency code
          type: integer
        - name: Agency name
          type: string
        - name: Bureau code
          type: integer
        - name: Bureau name
          type: string
        - name: Account code
          type: integer
        - name: Account name
          type: string
        - name: Treasury Agency code
          type: integer
        - name: On- or off-budget
          type: string
        - name: '1962'
          type: string
        - name: '1963'
          type: string
        - name: '1964'
          type: string
        - name: '1965'
          type: string
        - name: '1966'
          type: string
        - name: '1967'
          type: string
        - name: '1968'
          type: string
        - name: '1969'
          type: string
        - name: '1970'
          type: string
        - name: '1971'
          type: string
        - name: '1972'
          type: string
        - name: '1973'
          type: string
        - name: '1974'
          type: string
        - name: '1975'
          type: string
        - name: '1976'
          type: string
        - name: TQ
          type: string
        - name: '1977'
          type: string
        - name: '1978'
          type: string
        - name: '1979'
          type: string
        - name: '1980'
          type: string
        - name: '1981'
          type: string
        - name: '1982'
          type: string
        - name: '1983'
          type: string
        - name: '1984'
          type: string
        - name: '1985'
          type: string
        - name: '1986'
          type: string
        - name: '1987'
          type: string
        - name: '1988'
          type: string
        - name: '1989'
          type: string
        - name: '1990'
          type: string
        - name: '1991'
          type: string
        - name: '1992'
          type: string
        - name: '1993'
          type: string
        - name: '1994'
          type: string
        - name: '1995'
          type: string
        - name: '1996'
          type: string
        - name: '1997'
          type: string
        - name: '1998'
          type: string
        - name: '1999'
          type: string
        - name: '2000'
          type: string
        - name: '2001'
          type: string
        - name: '2002'
          type: string
        - name: '2003'
          type: string
        - name: '2004'
          type: string
        - name: '2005'
          type: string
        - name: '2006'
          type: string
        - name: '2007'
          type: string
        - name: '2008'
          type: string
        - name: '2009'
          type: string
        - name: '2010'
          type: string
        - name: '2011'
          type: string
        - name: '2012'
          type: string
        - name: '2013'
          type: string
        - name: '2014'
          type: string
        - name: '2015'
          type: string
        - name: '2016'
          type: string
        - name: '2017'
          type: string
        - name: '2018'
          type: string
        - name: '2019'
          type: string
        - name: '2020'
          type: string
  - name: budgets
    type: table
    path: budgets.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: budgetYear
          type: integer
        - name: forecastYear
          type: integer
        - name: value
          type: number
  - name: burtin
    type: table
    path: burtin.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: Bacteria
          type: string
        - name: Penicillin
          type: number
        - name: Streptomycin
          type: number
        - name: Neomycin
          type: number
        - name: Gram_Staining
          type: string
        - name: Genus
          type: string
  - name: cars
    type: table
    path: cars.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: Name
          type: string
        - name: Miles_per_Gallon
          type: integer
        - name: Cylinders
          type: integer
        - name: Displacement
          type: number
        - name: Horsepower
          type: integer
        - name: Weight_in_lbs
          type: integer
        - name: Acceleration
          type: number
        - name: Year
          type: date
        - name: Origin
          type: string
  - name: co2-concentration
    type: table
    path: co2-concentration.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: Date
          type: date
        - name: CO2
          type: number
        - name: adjusted CO2
          type: number
  - name: countries
    type: table
    path: countries.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: _comment
          type: string
        - name: year
          type: integer
        - name: fertility
          type: number
        - name: life_expect
          type: number
        - name: n_fertility
          type: number
        - name: n_life_expect
          type: number
        - name: country
          type: string
  - name: crimea
    type: table
    path: crimea.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: date
          type: date
        - name: wounds
          type: integer
        - name: other
          type: integer
        - name: disease
          type: integer
  - name: disasters
    type: table
    path: disasters.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: Entity
          type: string
        - name: Year
          type: integer
        - name: Deaths
          type: integer
  - name: driving
    type: table
    path: driving.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: side
          type: string
        - name: year
          type: integer
        - name: miles
          type: integer
        - name: gas
          type: number
  - name: earthquakes
    type: json
    path: earthquakes.json
    scheme: file
    format: geojson
    mediatype: text/geojson
    encoding: utf-8
  - name: ffox
    type: file
    path: ffox.png
    scheme: file
    format: png
    mediatype: image/png
    encoding: utf-8
  - name: flare-dependencies
    type: table
    path: flare-dependencies.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: source
          type: integer
        - name: target
          type: integer
  - name: flare
    type: table
    path: flare.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: id
          type: integer
        - name: name
          type: string
  - name: flights-10k
    type: table
    path: flights-10k.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: date
          type: string
        - name: delay
          type: integer
        - name: distance
          type: integer
        - name: origin
          type: string
        - name: destination
          type: string
  - name: flights-200k
    type: table
    path: flights-200k.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: delay
          type: integer
        - name: distance
          type: integer
        - name: time
          type: number
  - name: flights-20k
    type: table
    path: flights-20k.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: date
          type: string
        - name: delay
          type: integer
        - name: distance
          type: integer
        - name: origin
          type: string
        - name: destination
          type: string
  - name: flights-2k
    type: table
    path: flights-2k.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: date
          type: string
        - name: delay
          type: integer
        - name: distance
          type: integer
        - name: origin
          type: string
        - name: destination
          type: string
  - name: flights-3m
    type: table
    path: flights-3m.parquet
    scheme: file
    format: parquet
    mediatype: application/parquet
    schema:
      fields:
        - name: date
          type: integer
        - name: delay
          type: integer
        - name: distance
          type: integer
        - name: origin
          type: string
        - name: destination
          type: string
  - name: flights-5k
    type: table
    path: flights-5k.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: date
          type: string
        - name: delay
          type: integer
        - name: distance
          type: integer
        - name: origin
          type: string
        - name: destination
          type: string
  - name: flights-airport
    type: table
    path: flights-airport.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: origin
          type: string
        - name: destination
          type: string
        - name: count
          type: integer
  - name: football
    type: table
    path: football.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: date
          type: date
        - name: division
          type: string
        - name: home_team
          type: string
        - name: away_team
          type: string
        - name: home_score
          type: integer
        - name: away_score
          type: integer
  - name: gapminder-health-income
    type: table
    path: gapminder-health-income.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: country
          type: string
        - name: income
          type: integer
        - name: health
          type: number
        - name: population
          type: integer
        - name: region
          type: string
  - name: gapminder
    type: table
    path: gapminder.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: year
          type: integer
        - name: country
          type: string
        - name: cluster
          type: integer
        - name: pop
          type: integer
        - name: life_expect
          type: number
        - name: fertility
          type: number
  - name: gimp
    type: file
    path: gimp.png
    scheme: file
    format: png
    mediatype: image/png
    encoding: utf-8
  - name: github
    type: table
    path: github.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: time
          type: string
        - name: count
          type: integer
  - name: global-temp
    type: table
    path: global-temp.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: year
          type: integer
        - name: temp
          type: number
  - name: income
    type: table
    path: income.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: name
          type: string
        - name: region
          type: string
        - name: id
          type: integer
        - name: pct
          type: number
        - name: total
          type: integer
        - name: group
          type: string
  - name: iowa-electricity
    type: table
    path: iowa-electricity.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: year
          type: date
        - name: source
          type: string
        - name: net_generation
          type: integer
  - name: jobs
    type: table
    path: jobs.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: job
          type: string
        - name: sex
          type: string
        - name: year
          type: integer
        - name: count
          type: integer
        - name: perc
          type: number
  - name: la-riots
    type: table
    path: la-riots.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: first_name
          type: string
        - name: last_name
          type: string
        - name: age
          type: integer
        - name: gender
          type: string
        - name: race
          type: string
        - name: death_date
          type: date
        - name: address
          type: string
        - name: neighborhood
          type: string
        - name: type
          type: string
        - name: longitude
          type: number
        - name: latitude
          type: number
  - name: londonboroughs
    type: json
    path: londonBoroughs.json
    scheme: file
    format: topojson
    mediatype: text/topojson
    encoding: utf-8
  - name: londoncentroids
    type: table
    path: londonCentroids.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: name
          type: string
        - name: cx
          type: number
        - name: cy
          type: number
  - name: londontubelines
    type: json
    path: londonTubeLines.json
    scheme: file
    format: topojson
    mediatype: text/topojson
    encoding: utf-8
  - name: lookup_groups
    type: table
    path: lookup_groups.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: group
          type: integer
        - name: person
          type: string
  - name: lookup_people
    type: table
    path: lookup_people.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: name
          type: string
        - name: age
          type: integer
        - name: height
          type: integer
  - name: miserables
    type: json
    path: miserables.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: monarchs
    type: table
    path: monarchs.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: name
          type: string
        - name: start
          type: integer
        - name: end
          type: integer
        - name: index
          type: integer
  - name: movies
    type: table
    path: movies.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: Title
          type: string
        - name: US Gross
          type: integer
        - name: Worldwide Gross
          type: integer
        - name: US DVD Sales
          type: integer
        - name: Production Budget
          type: integer
        - name: Release Date
          type: string
        - name: MPAA Rating
          type: string
        - name: Running Time min
          type: integer
        - name: Distributor
          type: string
        - name: Source
          type: string
        - name: Major Genre
          type: string
        - name: Creative Type
          type: string
        - name: Director
          type: string
        - name: Rotten Tomatoes Rating
          type: integer
        - name: IMDB Rating
          type: number
        - name: IMDB Votes
          type: integer
  - name: normal-2d
    type: table
    path: normal-2d.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: u
          type: number
        - name: v
          type: number
  - name: obesity
    type: table
    path: obesity.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: id
          type: integer
        - name: rate
          type: number
        - name: state
          type: string
  - name: ohlc
    type: table
    path: ohlc.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: date
          type: date
        - name: open
          type: number
        - name: high
          type: number
        - name: low
          type: number
        - name: close
          type: number
        - name: signal
          type: string
        - name: ret
          type: number
  - name: penguins
    type: table
    path: penguins.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: Species
          type: string
        - name: Island
          type: string
        - name: Beak Length (mm)
          type: number
        - name: Beak Depth (mm)
          type: number
        - name: Flipper Length (mm)
          type: integer
        - name: Body Mass (g)
          type: integer
        - name: Sex
          type: string
  - name: platformer-terrain
    type: table
    path: platformer-terrain.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: x
          type: integer
        - name: y
          type: integer
        - name: lumosity
          type: number
        - name: saturation
          type: integer
        - name: name
          type: string
        - name: id
          type: string
        - name: color
          type: string
        - name: key
          type: string
  - name: points
    type: table
    path: points.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: x
          type: number
        - name: y
          type: number
  - name: political-contributions
    type: table
    path: political-contributions.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: Candidate_Identification
          type: string
        - name: Candidate_Name
          type: string
        - name: Incumbent_Challenger_Status
          type: string
        - name: Party_Code
          type: integer
        - name: Party_Affiliation
          type: string
        - name: Total_Receipts
          type: number
        - name: Transfers_from_Authorized_Committees
          type: integer
        - name: Total_Disbursements
          type: number
        - name: Transfers_to_Authorized_Committees
          type: number
        - name: Beginning_Cash
          type: number
        - name: Ending_Cash
          type: number
        - name: Contributions_from_Candidate
          type: number
        - name: Loans_from_Candidate
          type: integer
        - name: Other_Loans
          type: integer
        - name: Candidate_Loan_Repayments
          type: number
        - name: Other_Loan_Repayments
          type: integer
        - name: Debts_Owed_By
          type: number
        - name: Total_Individual_Contributions
          type: integer
        - name: Candidate_State
          type: string
        - name: Candidate_District
          type: integer
        - name: Contributions_from_Other_Political_Committees
          type: integer
        - name: Contributions_from_Party_Committees
          type: integer
        - name: Coverage_End_Date
          type: string
        - name: Refunds_to_Individuals
          type: integer
        - name: Refunds_to_Committees
          type: integer
  - name: population
    type: table
    path: population.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: year
          type: integer
        - name: age
          type: integer
        - name: sex
          type: integer
        - name: people
          type: integer
  - name: population_engineers_hurricanes
    type: table
    path: population_engineers_hurricanes.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: state
          type: string
        - name: id
          type: integer
        - name: population
          type: integer
        - name: engineers
          type: number
        - name: hurricanes
          type: integer
  - name: seattle-weather-hourly-normals
    type: table
    path: seattle-weather-hourly-normals.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: date
          type: datetime
        - name: pressure
          type: number
        - name: temperature
          type: number
        - name: wind
          type: number
  - name: seattle-weather
    type: table
    path: seattle-weather.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: date
          type: date
        - name: precipitation
          type: number
        - name: temp_max
          type: number
        - name: temp_min
          type: number
        - name: wind
          type: number
        - name: weather
          type: string
  - name: sp500-2000
    type: table
    path: sp500-2000.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: date
          type: date
        - name: open
          type: number
        - name: high
          type: number
        - name: low
          type: number
        - name: close
          type: number
        - name: adjclose
          type: number
        - name: volume
          type: integer
  - name: sp500
    type: table
    path: sp500.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: date
          type: string
        - name: price
          type: number
  - name: stocks
    type: table
    path: stocks.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: symbol
          type: string
        - name: date
          type: string
        - name: price
          type: number
  - name: udistrict
    type: table
    path: udistrict.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: key
          type: string
        - name: lat
          type: number
  - name: unemployment-across-industries
    type: table
    path: unemployment-across-industries.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: series
          type: string
        - name: year
          type: integer
        - name: month
          type: integer
        - name: count
          type: integer
        - name: rate
          type: number
        - name: date
          type: datetime
  - name: unemployment
    type: table
    path: unemployment.tsv
    scheme: file
    format: tsv
    mediatype: text/tsv
    encoding: utf-8
    dialect:
      csv:
        delimiter: "\t"
    schema:
      fields:
        - name: id
          type: integer
        - name: rate
          type: number
  - name: uniform-2d
    type: table
    path: uniform-2d.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: u
          type: number
        - name: v
          type: number
  - name: us-10m
    type: json
    path: us-10m.json
    scheme: file
    format: topojson
    mediatype: text/topojson
    encoding: utf-8
  - name: us-employment
    type: table
    path: us-employment.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: month
          type: date
        - name: nonfarm
          type: integer
        - name: private
          type: integer
        - name: goods_producing
          type: integer
        - name: service_providing
          type: integer
        - name: private_service_providing
          type: integer
        - name: mining_and_logging
          type: integer
        - name: construction
          type: integer
        - name: manufacturing
          type: integer
        - name: durable_goods
          type: integer
        - name: nondurable_goods
          type: integer
        - name: trade_transportation_utilties
          type: integer
        - name: wholesale_trade
          type: number
        - name: retail_trade
          type: number
        - name: transportation_and_warehousing
          type: number
        - name: utilities
          type: number
        - name: information
          type: integer
        - name: financial_activities
          type: integer
        - name: professional_and_business_services
          type: integer
        - name: education_and_health_services
          type: integer
        - name: leisure_and_hospitality
          type: integer
        - name: other_services
          type: integer
        - name: government
          type: integer
        - name: nonfarm_change
          type: integer
  - name: us-state-capitals
    type: table
    path: us-state-capitals.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: lon
          type: number
        - name: lat
          type: number
        - name: state
          type: string
        - name: city
          type: string
  - name: volcano
    type: json
    path: volcano.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: weather
    type: table
    path: weather.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: location
          type: string
        - name: date
          type: date
        - name: precipitation
          type: number
        - name: temp_max
          type: number
        - name: temp_min
          type: number
        - name: wind
          type: number
        - name: weather
          type: string
  - name: weather
    type: json
    path: weather.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
  - name: wheat
    type: table
    path: wheat.json
    scheme: file
    format: json
    mediatype: text/json
    encoding: utf-8
    dialect:
      json:
        keyed: true
    schema:
      fields:
        - name: year
          type: integer
        - name: wheat
          type: number
        - name: wages
          type: number
  - name: windvectors
    type: table
    path: windvectors.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: longitude
          type: number
        - name: latitude
          type: number
        - name: dir
          type: integer
        - name: dirCat
          type: integer
        - name: speed
          type: number
  - name: world-110m
    type: json
    path: world-110m.json
    scheme: file
    format: topojson
    mediatype: text/topojson
    encoding: utf-8
  - name: zipcodes
    type: table
    path: zipcodes.csv
    scheme: file
    format: csv
    mediatype: text/csv
    encoding: utf-8
    schema:
      fields:
        - name: zip_code
          type: integer
        - name: latitude
          type: number
        - name: longitude
          type: number
        - name: city
          type: string
        - name: state
          type: string
        - name: county
          type: string

The following have limited metadata:

annual-precip.json
earthquakes.json
londonBoroughs.json
londonTubeLines.json
miserables.json
us-10m.json
volcano.json
weather.json
world-110m.json

They are all either:

GeoJSON
TopoJSON
Regular, but not tabular, JSON

flights-200k.arrow is the only fully unsupported file

domoritz · 2024-11-26T19:14:55Z

Nice. Let's add this to the repo. We should have a script to generate it, though, so I can make sure it stays up to date.

dangotbanned · 2024-11-26T19:16:35Z

Nice. Let's add this to the repo. We should have a script to generate it, though, so I can make sure it stays up to date.

Thanks @domoritz

I'll try to get a PR up later ~~/tomorrow~~ once I've tidied things up a bit (#631)

Closes #629 - Adds `build_datapackage.py` script - Generates initial metadata in both `.yaml` and `.json` formats

* feat: generate `frictionless` data package metadata Closes vega#629 - Adds `build_datapackage.py` script - Generates initial metadata in both `.yaml` and `.json` formats * feat(typing): spell mappings more explicitly Improves readability, but mainly to support per-resource `description`, `sources`, `licenses` See vega#631 (comment) * refactor(ruff): misc linting * ci: change default output to `json`, fix missing `contributors` vega#631 (review), vega#631 (comment) * feat: add support for `.arrow` vega#631 (comment), vega#631 (comment) * feat(DRAFT): add `.with_extras()`, for `description`, `source`, and `license` Unused currently, depends on having a more structured `SOURCES.md` vega#631 (comment) * add data package to build step * ci: add uv * ci: fix uv setup * ci: fail if there are changes * just kidding (timestamps change things) * chore: update pr template --------- Co-authored-by: Dominik Moritz <[email protected]>

- Adds SOURCES.toml to provide supplemental metadata on resources for build_datapackage.py - TOML structure designed to sync with Frictionless Data Resource 2.0 specifications - Includes resource descriptions, sources, and licenses to supplement script output, where available in SOURCES.md - Preserves existing markdown content for use in human-readable source documentation - TODO: Remove duplicated content between descriptions and sources - TODO: Verify compatibility with build_datapackage.py - TODO: Incorporate resource-level column descriptions into table schema, where currently included - TODO: determine if root-level $schema property should be specified in the TOML file with the value "https://datapackage.org/profiles/2.0/datapackage.json" per Frictionless spec Part of vega#629

dangotbanned added the enhancement label Nov 24, 2024

dangotbanned mentioned this issue Nov 24, 2024

feat(RFC): Adds altair.datasets vega/altair#3631

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18 tasks

domoritz mentioned this issue Nov 26, 2024

Support describing JSON files frictionlessdata/frictionless-py#1712

Open

dangotbanned added a commit that referenced this issue Nov 26, 2024

feat: generate frictionless data package metadata

ffb5c75

Closes #629 - Adds `build_datapackage.py` script - Generates initial metadata in both `.yaml` and `.json` formats

dangotbanned mentioned this issue Nov 26, 2024

feat: generate frictionless data package metadata #631

Merged

domoritz closed this as completed in #631 Nov 27, 2024

domoritz closed this as completed in 3987d4e Nov 27, 2024

dangotbanned mentioned this issue Nov 29, 2024

Creation of SOURCES.toml #634

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Additional metadata for datasets #629

Additional metadata for datasets #629

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Additional metadata for datasets #629

Additional metadata for datasets #629

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