# Wikidata JSKOS
[](https://github.com/gbv/wikidata-jskos/releases/latest)
[](https://coli-conc.gbv.de/services/wikidata/)
[](./LICENSE.md)
[](./docker/README.md)
[](https://github.com/gbv/wikidata-jskos/actions/workflows/test.yml)
[](https://www.npmjs.org/package/wikidata-jskos)
[](https://github.com/RichardLitt/standard-readme)
> Access [Wikidata] in [JSKOS] format
This node module provides [a web service](#web-service), a [command line client](#command-line-tool), and [a library](#api) to access Wikidata in [JSKOS] format. The data includes Wikidata items as concepts and concept schemes (read) and mappings between Wikidata and other authority files (read and write).
## Table of Contents
- [Background](#background)
- [Install](#install)
- [Docker](#docker)
- [Node.js](#nodejs)
- [Configuration](#configuration)
- [Usage](#usage)
- [Web Service](#web-service)
- [Authentication](#authentication)
- [GET /status](#get-status)
- [GET /concepts](#get-concepts)
- [GET /concepts/suggest](#get-conceptssuggest)
- [GET /mappings](#get-mappings)
- [GET /mappings/voc](#get-mappingsvoc)
- [GET /mappings/:\_id](#get-mappings_id)
- [POST /mappings](#post-mappings)
- [PUT /mappings/:\_id](#put-mappings_id)
- [DELETE /mappings/:\_id](#delete-mappings_id)
- [Command line tool](#command-line-tool)
- [wdjskos concept](#wdjskos-concept)
- [wdjskos mappings](#wdjskos-mappings)
- [wdjskos schemes](#wdjskos-schemes)
- [wdjskos update](#wdjskos-update)
- [wdjskos find](#wdjskos-find)
- [wdjskos mapping-item](#wdjskos-mapping-item)
- [API](#api)
- [mapEntity](#mapentity)
- [Map selected parts of a Wikidata entity](#map-selected-parts-of-a-wikidata-entity)
- [Map simplified Wikidata entities](#map-simplified-wikidata-entities)
- [mapMapping](#mapmapping)
- [Maintainers](#maintainers)
- [Publish](#publish)
- [Contributing](#contributing)
- [License](#license)
[mapEntity]: #mapentity
[mapMapping]: #mapmapping
## Background
[Wikidata] is a large knowledge base with detailed information about all kinds of entities. Mapping its data model to [JSKOS] data format allows simplified reuse of Wikidata as authority file. This implementation is used in the [Cocoda web application](https://coli-conc.gbv.de/cocoda/) but it can also be used independently.
The mapping between Wikidata and JSKOS format includes:
* Wikidata items expressed as authority records ([JSKOS Concepts](https://gbv.github.io/jskos/jskos.html#concept))
* Selected Wikidata items covering information about authority files ([JSKOS Concept Schemes](https://gbv.github.io/jskos/jskos.html#concept-schemes))
* Selected Wikidata statements linking Wikidata to other authority files ([JSKOS Mappings](https://gbv.github.io/jskos/jskos.html#concept-mappings))
In addition a search service is provided for selecting a Wikidata item with typeahead.
Editing Wikidata mapping statements to other authority files requires [authentification](#authentification) via OAuth. The following authority files have been tested succesfully:
* Basisklassifikation (BK)
* Regensburg Classification (RVK)
* Integrated Authority File (GND)
* Nomisma
* Iconclass
Other systems (not including DDC) may also work but they have not been converted to JSKOS yet, so they are not provided for browsing in Cocoda.
## Install
### Docker
The easiest way to run wikidata-jskos is via Docker. Please refer to the [Docker documentation](./docker/README.md).
### Node.js
Node.js 18 is required (Node.js 20 recommended).
```sh
git clone https://github.com/gbv/wikidata-jskos.git
cd wikidata-jskos
npm ci
```
Optionally make the [command line tool](#command-line-tool) `wdjskos` available:
```sh
npm link
```
For development of the web service with hot reload and auto reconnect at :
```bash
npm run start
```
For deployment of the web service (if not using Docker) there is a config file to use with [pm2](http://pm2.keymetrics.io/):
```bash
cp ecosystem.example.json ecosystem.config.json
pm2 start ecosystem.config.json
```
## Configuration
You can customize the application settings via a configuration file, e.g. by providing a generic `config.json` file and/or a more specific `config.{env}.json` file (where `{env}` is the environment like `development` or `production`). The latter will have precendent over the former, and all missing keys will be defaulted with values from `config.default.json`.
All configuration options can also be set via environment variables (`.env` when running via Node.js or using `environment` or `env_file` in Docker Compose).
Some notes:
- To use a custom Wikibase instance, you can set the subkeys of the `wikibase` property. Both `instance` and `sparqlEnpoint` are necessary. By default, Wikidata is used.
- wikidata-jskos supports saving, editing, and deleting mappings in Wikidata. To enable this, you will need to provide `auth.algorithm` and `auth.key` (algorithm and key to decode the JWT, usually coming from [login-server]), as well as `oauth.consumer_key` and `oauth.consumer_secret` (for your registered OAuth consumer).
- `auth.key`/`AUTH_KEY` contain line breaks. In JSON, these can simply be set as `\n`. When using `.env` or `env_file`, the whole key needs to be double-quoted (`"-----BEGIN PUBLIC KEY-----\n..."`). To set `AUTH_KEY` directly in `docker-compose.yml` via `environment`, please look at the included [`docker-compose.yml`](./docker/docker-compose.yml) file or refer to [this StackOverflow answer](https://stackoverflow.com/a/53198865).
- Please provide a `baseUrl` when used in production. If no baseUrl is provided, `http://localhost:${port}/` will be used.
- List of all available configuration options:
| `config.json` key | environment variable | default value |
| ----------------------- | -------------------- | ----------------------------------- |
| title | TITLE | Wikidata JSKOS Service |
| wikibase.instance | WIKIBASE_INSTANCE | `https://www.wikidata.org` |
| wikibase.sparqlEndpoint | WIKIBASE_SPARQL | `https://query.wikidata.org/sparql` |
| wikibase.api | WIKIBASE_API | `${wikibase.instance}/w/api.php` |
| verbosity | VERBOSITY | false |
| baseUrl | BASE_URL | `http://localhost:${port}/` |
| port | PORT | 2013 |
| auth.algorithm | AUTH_ALGORITHM | HS256 |
| auth.key | AUTH_KEY | null |
| oauth.consumer_key | OAUTH_KEY | null |
| oauth.consumer_secret | OAUTH_SECRET | null |
The list of concept schemes to read and write mappings to, is hard-coded in directory [assests](assets). To update concept schemes, regularly run:
```bash
npm run update
```
## Usage
See below for use of the [Web Service](#web-service), the [command line tool](#command-line-tool), and the JavaScript [API](#api).
## Web Service
An instance is available at . The service provides selected endpoints of [JSKOS API](https://github.com/gbv/jskos-server#api).
### Authentication
The following endpoints require an authenticated user:
- [POST /mappings](#post-mappings)
- [PUT /mappings/:_id](#put-mappings_id)
- [DELETE /mappings/:_id](#delete-mappings_id)
Authentication works via a JWT (JSON Web Token). The JWT has to be provided as a Bearer token in the authentication header, e.g. `Authentication: Bearer `. It is integrated with [login-server] and the JWT is required to have the same format as the one login-server provides. Specifically, the OAuth token and secret for the user need to be provided as follows:
```json
{
"user": {
"identities": {
"wikidata": {
"oauth": {
"token": "..",
"token_secret": "..."
}
}
}
}
}
```
There are more properties in the JWT, but those are not used by wikidata-jskos. Note that the JWT needs to be signed with the respective private key for the public key provided in the [configuration](#configuration). Also, the OAuth user token and secret need to come from the same OAuth consumer provided in the config.
### GET /status
Returns a JSKOS API status object. See [JSKOS Server] for details.
### GET /concepts
Look up Wikidata items as [JSKOS Concepts] by their entity URI or QID.
* **URL Params**
`uri=[uri]` URIs for concepts separated by `|`.
`language` or `languages`: comma separated list of language codes.
* **Success Response**
JSON array of [JSKOS Concepts]
Only some Wikidata properties are mapped to JSKOS fields. The result also
contains `broader` links determined by an additional SPARQL request.
Deprected alias at `/concept` is going to be removed.
### GET /concepts/suggest
OpenSearch Suggest endpoint for typeahead search.
[JSKOS Concept Schemes]: https://gbv.github.io/jskos/jskos.html#concept-schemes
[JSKOS Server]: https://github.com/gbv/jskos-server
[JSKOS Concepts]: https://gbv.github.io/jskos/jskos.html#concept
[JSKOS Concept Mappings]: https://gbv.github.io/jskos/jskos.html#concept-mappings
[Wikidata properties for authority control]: http://www.wikidata.org/entity/Q18614948
Deprected aliases at `/concept/suggest` and `/suggest` are going to be removed.
### GET /mappings
Look up Wikidata mapping statements as [JSKOS Concept Mappings] between
Wikidata items (query parameter `from`) and external identifiers (query
parameter `to`). At least one of both parameters must be given.
* **URL Params**
`from=[uriOrNotation1|uriOrNotation2|...]` specify the source URI or notation (multiple URIs/notations separated by `|`)
`to=[uriOrNotation1|uriOrNotation2|...]` specify the target URI or notation (multiple URIs/notations separated by `|`)
`fromScheme=[uri|notation]` only show mappings from this concept scheme (URI or notation)
`toScheme=[uri|notation]` only show mappings to this concept scheme (URI or notation)
`language` or `languages` enables inclusion of entity labels. A comma separated list of language codes is used as preference list.
`mode=[mode]` specify the mode for `from`, `to`, one of `and` (default) and `or`
`direction=forward|backward|both` searches mappings from `from` to `to` (default), reverse, or in both directions
`limit=[number]` maximum number of mappings to return (not fully implemented)
`offset=[number]` start number of mappings to return (not fully implemented)
Concept Schemes are identified by BARTOC IDs (e.g. `).
* **Success Response**
JSON array of [JSKOS Concept Mappings]
* ***Examples***
`?from=http://www.wikidata.org/entity/Q42`
`?to=http://d-nb.info/gnd/119033364`
Mapping relation types ([P4390]) are respected, if given, see for example
mapping from Wikidata to .
[P1921]: http://www.wikidata.org/entity/P1921
[P1793]: http://www.wikidata.org/entity/P1793
[P1629]: http://www.wikidata.org/entity/P1629
[P2689]: http://www.wikidata.org/entity/P2689
[P4390]: http://www.wikidata.org/entity/P2689
### GET /mappings/voc
Look up Wikidata items with [Wikidata properties for authority control] as
[JSKOS Concept Schemes] with used for mappings. These schemes need to have a
BARTOC-ID ([P2689]), and be subject item ([P1629]) of an external identifier
property with statements [P1921] (URI template) and [P1793] (regular
expression).
* **URL Params**
None.
* **Success Response**
JSON array of [JSKOS Concept Schemes]
### GET /mappings/:_id
Returns a specific mapping for a Wikidata claim/statement.
* **Success Response**
JSKOS object for mapping.
* **Error Response**
If no claim with `_id` could be found, it will return a 404 not found error.
* **Sample Call**
```bash
curl https://coli-conc.gbv.de/services/wikidata/mappings/Q11351-9968E140-6CA7-448D-BF0C-D8ED5A9F4598
```
```json
{
"uri": "http://localhost:2013/mappings/Q11351-9968E140-6CA7-448D-BF0C-D8ED5A9F4598",
"identifier": [
"http://www.wikidata.org/entity/statement/Q11351-9968E140-6CA7-448D-BF0C-D8ED5A9F4598",
"urn:jskos:mapping:content:2807c55eac85ed8c0c9254ff04b457f89b801ac9",
"urn:jskos:mapping:members:daafcd8580e6f0304f0b1cee024f65f04da98a3c"
],
"to": {
"memberSet": [
{
"uri": "http://rvk.uni-regensburg.de/nt/VK",
"notation": [
"VK"
]
}
]
},
"type": [
"http://www.w3.org/2004/02/skos/core#exactMatch"
],
"fromScheme": {
"uri": "http://bartoc.org/en/node/1940",
"notation": [
"WD"
]
},
"toScheme": {
"uri": "http://bartoc.org/en/node/533",
"notation": [
"RVK"
]
},
"from": {
"memberSet": [
{
"uri": "http://www.wikidata.org/entity/Q11351",
"notation": [
"Q11351"
]
}
]
},
"@context": "https://gbv.github.io/jskos/context.json"
}
```
### POST /mappings
Saves a mapping in Wikidata. Requires [authentication](#authentication).
Note that if an existing mapping in Wikidata is found with the exact same members, that mapping will be overwritten by this request.
* **Success Reponse**
JSKOS Mapping object as it was saved in Wikidata.
### PUT /mappings/:_id
Overwrites a mapping in Wikidata. Requires [authentication](#authentication).
* **Success Reponse**
JSKOS Mapping object as it was saved in Wikidata.
### DELETE /mappings/:_id
Deletes a mapping from Wikidata. Requires [authentication](#authentication).
* **Success Reponse**
Status 204, no content.
## Command line tool
The command line client `wdjskos` provides roughly the same commands as accessible via
[the web service](#web-service).
Mapping schemes are cached in the subfolder `./cache`. To update the cache
include option `--force` or run command `update`.
### wdjskos concept
Look up Wikidata items as [JSKOS Concepts].
wdjskos concept Q42
### wdjskos mappings
Look up [JSKOS Concept Mappings].
wdjskos mappings Q42 | jq .to.memberSet[].uri
wdjskos mappings - http://viaf.org/viaf/113230702
A single hyphen (`-`) can be used to nullify argument `from` or `to`,
respectively. Mappings can be limited to a target scheme. These are equivalent:
wdjskos --scheme P227 mappings Q42
wdjskos --scheme 430 mappings Q42
wdjskos --scheme http://bartoc.org/en/node/430 mappings Q42
### wdjskos schemes
Return up [JSKOS Concept Schemes] with [Wikidata properties for authority control].
### wdjskos update
Look up concept schemes from Wikidata and update the cache.
### wdjskos find
Search a Wikidata item by its names and return OpenSearch Suggestions response.
### wdjskos mapping-item
Convert a JSKOS mapping to a Wikidata item.
wdjskos mapping-item mapping.json
wdjskos --simplfiy mapping-item mapping.json
## API
The node library can be used to convert Wikidata JSON format to JSKOS
([mapEntity]) and to convert JSKOS mappings to Wikidata JSON format
([mapMapping]).
### mapEntity
```js
jskos = wds.mapEntity(entity)
```
Entity data can be retrieved via Wikidata API method [wbgetentities] and from
Wikidata database dumps. See JavaScript libraries [wikidata-sdk] and
[wikidata-filter] for easy access and processing.
#### Map selected parts of a Wikidata entity
All methods return a JSKOS item.
```js
jskos = wds.mapIdentifier(entity.id)
// { uri: "http://www.wikidata.org/entity/...", notation: [ "..." ] }
jskos = wds.mapLabels(entity.labels)
// { prefLabel: { ... } }
jskos = wds.mapAliases(entity.aliases)
// { altLabel: { ... } }
jskos = wds.mapDescriptions(entity.descriptions)
// { scopeNote: { ... } }
jskos = wds.mapSitelinks(entity.sitelinks)
// { occurrences: [ { ... } ], subjectOf: [ { url: ... }, ... ] }
jskos = wds.mapClaims(entity.claims)
// ...
// convert claims with mapping properties
jskos = wds.mapMappingClaims(claims)
jskos = wds.mapInfo(entity)
// ...
```
#### Map simplified Wikidata entities
Each method has a counterpart to map simplified Wikidata entities.
```js
jskos = wds.mapSimpleEntity(entity)
jskos = wds.mapSimpleIdentifier(entity.id)
jskos = wds.mapSimpleLabels(entity.labels)
...
```
### mapMapping
Convert a JSKOS mapping into a Wikidata claim. Only respects JSKOS fields
`from`, `to`, `uri`, and `type` (if given) and only supports 1-to-1 mappings
from a single Wikidata item to a concept in another concept scheme.
*this is work in progress!*
## Maintainers
- [@nichtich](https://github.com/nichtich)
### Publish
**For maintainers only**
Please work on the `dev` branch during development (or better yet, develop in a feature branch and merge into `dev` when ready).
When a new release is ready (i.e. the features are finished, merged into `dev`, and all tests succeed), run the included release script (replace "patch" with "minor" or "major" if necessary):
```bash
npm run release:patch
```
This will:
- Check that we are on `dev`
- Run tests and build to make sure everything works
- Make sure `dev` is up-to-date
- Run `npm version patch` (or "minor"/"major")
- **Ask you to confirm the version**
- Push changes to `dev`
- Switch to `main`
- Merge changes from `dev`
- Push `main` with tags
- Switch back to `dev`
After running this, GitHub Actions will automatically create a new GitHub Release draft. Please edit and publish the release manually.
## Contributing
PRs accepted against the `dev` branch.
To enbale debugging ouput set enviroment variable `DEBUG` to comma-separated list of components (`sparql`, `http`, `query`).
Please lint JavaScript code (e.g. run `npm run lint` or `npm run fix`).
If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
## License
[MIT © 2024 Verbundzentrale des GBV (VZG)](LICENSE.md)
[wbgetentities]: https://www.wikidata.org/w/api.php?action=help&modules=wbgetentities
[wikidata-sdk]: https://github.com/maxlath/wikidata-sdk
[wikidata-cli]: https://github.com/maxlath/wikidata-cli
[wikidata-filter]: https://github.com/maxlath/wikidata-filter
[Wikidata]: https://www.wikidata.org/
[JSKOS]: https://gbv.github.io/jskos/
[login-server]: https://github.com/gbv/login-server