Q.: How can users access the OPDS catalogue?

A.: OPDS catalogue URL http://yoursite.com/feed/opds.

```js const axios = require('axios'); const epub = require('epub-gen');

axios.get('http://www.gutenberg.org/files/2701/2701-0.txt'). then(res => res.data). then(text => { text = text.slice(text.indexOf('EXTRACTS.')); text = text.slice(text.indexOf('CHAPTER 1.'));

const lines = text.split('\r\n');
const content = [];
for (let i = 0; i < lines.length; ++i) {
  const line = lines[i];
  if (line.startsWith('CHAPTER ')) {
    if (content.length) {
      content[content.length - 1].data = content[content.length - 1].data.join('\n');
    }
    content.push({
      title: line,
      data: ['<h2>' + line + '</h2>']
    });
  } else if (line.trim() === '') {
    if (content[content.length - 1].data.length > 1) {
      content[content.length - 1].data.push('</p>');
    }
    content[content.length - 1].data.push('<p>');
  } else {
    content[content.length - 1].data.push(line);
  }
}

const options = {
  title: 'Moby-Dick',
  author: 'Herman Melville',
  output: './moby-dick.epub',
  content
};

return new epub(options).promise;

}). then(() => console.log('Done')); ```

This appendix is informative

All examples use the same hypothetical publication of Alice in Wonderland, and are given in the collection structure with a single annotation.

• Commentary Annotation on Publication with URI json-ld { "@context": "http://www.idpf.org/epub/oa/1.0/context.json", "@id": "http://example.org/epub/annotations.json", "@type": "epub:AnnotationCollection", "annotations": [ { "@id": "urn:uuid:E7E3799F-3CD5-4F69-87C6-5478B22873D6", "@type": "oa:Annotation", "hasTarget": { "@type": "oa:SpecificResource", "hasSource": { "@id": "http://www.example.org/ebooks/A1B0D67E-2E81-4DF5/v2.epub", "@type": "dctypes:Text" } }, "hasBody": { "@type": "dctypes:Text", "format": "application/xhtml+xml", "chars": "<div xml:lang='en' xmlns='http://www.w3.org/1999/xhtml'>I love Alice in Wonderland</div>", "language": "en" }, "motivatedBy": "oa:commenting" } ] }

• Commentary Annotation on Publication without Identifying URI json-ld { "@context": "http://www.idpf.org/epub/oa/1.0/context.json", "@id": "http://example.org/epub/annotations.json", "@type": "epub:AnnotationCollection", "annotations": [ { "@id": "urn:uuid:E7E3799F-3CD5-4F69-87C6-5478B22873D6", "@type": "oa:Annotation", "hasTarget": { "@type": "oa:SpecificResource", "hasSource": { "@type": "dctypes:Text", "uniqueIdentifier": "isbn:123456789x", "originURL": "http://www.example.com/publisher/book/", "dc:identifier": "urn:uuid:A1B0D67E-2E81-4DF5-9E67-A64CBE366809", "dcterms:modified": "2011-01-01T12:00:00Z" } }, "hasBody": { "@type": "dctypes:Text", "format": "application/xhtml+xml", "chars": "<div xml:lang='en' xmlns='http://www.w3.org/1999/xhtml'>I love Alice in Wonderland</div>", "language": "en" }, "motivatedBy": "oa:commenting" } ] }

• Collection Metadata json-ld { "@context": "http://www.idpf.org/epub/oa/1.0/context.json", "@id": "http://example.org/epub/annotations.json", "@type": "epub:AnnotationCollection", "dc:title": "Alice in Wonderland Annotations", "dc:publisher": "Example Organization", "dc:creator": "Anne O'Tater", "dcterms:modified": "2014-03-17T12:30:00Z", "dc:description": "Anne's collection of annotations on Alice in Wonderland", "dc:rights": [ { "@value": "Quelques droits en Français", "@language": "fr" }, { "@value": "Some Rights in English", "@language": "en" } ], "annotations": [ { "@id": "urn:uuid:E7E3799F-3CD5-4F69-87C6-5478B22873D6", "@type": "oa:Annotation", "hasTarget": { "@type": "oa:SpecificResource", "hasSource": { "@type": "dctypes:Text", "uniqueIdentifier": "isbn:123456789x", "originURL": "http://www.example.com/publisher/book/", "dc:identifier": "urn:uuid:A1B0D67E-2E81-4DF5-9E67-A64CBE366809", "dcterms:modified": "2011-01-01T12:00:00Z" } }, "hasBody": { "@type": "dctypes:Text", "format": "application/xhtml+xml", "chars": "<div xml:lang='en' xmlns='http://www.w3.org/1999/xhtml'>I love Alice in Wonderland</div>", "language": "en" }, "motivatedBy": "oa:commenting" } ] }

• Annotation with Ancillary Resources in the Zip json-ld { "@context": "http://www.idpf.org/epub/oa/1.0/context.json", "@id": "http://example.org/epub/annotations.json", "@type": "epub:AnnotationCollection", "annotations": [ { "@id": "urn:uuid:E7E3799F-3CD5-4F69-87C6-5478B22873D6", "@type": "oa:Annotation", "hasTarget": { "@type": "oa:SpecificResource", "hasSource": { "@type": "dctypes:Text", "uniqueIdentifier": "isbn:123456789x", "originURL": "http://www.example.com/publisher/book/", "dc:identifier": "urn:uuid:A1B0D67E-2E81-4DF5-9E67-A64CBE366809", "dcterms:modified": "2011-01-01T12:00:00Z" } }, "hasBody": { "@type": "dctypes:Text", "format": "application/xhtml+xml", "chars": "<div xml:lang='en' xmlns='http://www.w3.org/1999/xhtml'>I love Alice in Wonderland! <img src='/imgs/heart.jpg'/></div>" }, "motivatedBy": "oa:commenting" } ] }

• Styling of Selection

json-ld { "@context": "http://www.idpf.org/epub/oa/1.0/context.json", "@id": "http://example.org/epub/annotations.json", "@type": "epub:AnnotationCollection", "annotations": [ { "@id": "urn:uuid:E7E3799F-3CD5-4F69-87C6-5478B22873D6", "@type": "oa:Annotation", "styledBy": { "@type": "oa:CssStyle", "format": "text/css", "chars": ".red { border: 1px solid red; }" }, "hasTarget": { "@type": "oa:SpecificResource", "hasSelector": { "@type": "oa:FragmentSelector", "value": "epubcfi(/6/4[chap01ref]!/4[body01]/10[para05]/3:10)" }, "hasSource": { "@type": "dctypes:Text", "uniqueIdentifier": "isbn:123456789x", "originURL": "http://www.example.com/publisher/book/", "dc:identifier": "urn:uuid:A1B0D67E-2E81-4DF5-9E67-A64CBE366809", "dcterms:modified": "2011-01-01T12:00:00Z" }, "styleClass": "red" }, "hasBody": { "@type": "dctypes:Text", "format": "application/xhtml+xml", "chars": "<div xml:lang='en' xmlns='http://www.w3.org/1999/xhtml'>I love this part of the text</div>", "language": "en" }, "motivatedBy": "oa:commenting" } ] }

• Replying to an Annotation json-ld { "@context": "http://www.idpf.org/epub/oa/1.0/context.json", "@id": "http://example.org/epub/annotations.json", "@type": "epub:AnnotationCollection", "annotations": [ { "@id": "urn:uuid:B81AF8C4-B04A-4D3D-B1D3-23F7C02E56BB", "@type": "oa:Annotation", "motivatedBy": "oa:replying", "hasTarget": "urn:uuid:E7E3799F-3CD5-4F69-87C6-5478B22873D6", "hasBody": { "@type": "dctypes:Text", "format": "application/xhtml+xml", "chars": "<span xmlns='http://www.w3.org/1999/xhtml'>I agree!</span>" } } ] }

js const html = document.getElementsByTagName('html')[0]; const toggleTheme = (theme) => { html.dataset.theme = theme; } html <script> // If `prefers-color-scheme` is not supported, fall back to light mode. // In this case, light.css will be downloaded with `highest` priority. if (window.matchMedia('(prefers-color-scheme: dark)').media === 'not all') { document.documentElement.style.display = 'none'; document.head.insertAdjacentHTML( 'beforeend', '<link rel="stylesheet" href="/light.css" onload="document.documentElement.style.display = \'\'">' ); } </script> <!-- Conditionally either load the light or the dark stylesheet. The matching file will be downloaded with `highest`, the non-matching file with `lowest` priority. If the browser doesn't support `prefers-color-scheme`, the media query is unknown and the files are downloaded with `lowest` priority (but above I already force `highest` priority for my default light experience). --> <link rel="stylesheet" href="/dark.css" media="(prefers-color-scheme: dark)"> <link rel="stylesheet" href="/light.css" media="(prefers-color-scheme: light)"> <!-- The main stylesheet --> <link rel="stylesheet" href="/style.css">

html <img src="./sun.svg" data-light-src="./sun.svg" data-dark-src="./moon.svg" alt="light theme" id="theme-selector" onclick="switchTheme(this)">

The only catch with this method is, it will also invert all the images in your application. So we will add the same rule to all images to reverse the effect. css html[theme='dark-mode'] img{ filter: invert(1) hue-rotate(180deg); } and we will also add a transition to the HTML element to make sure the transition does not become flashy!

css html { transition: color 300ms, background-color 300ms; }

bash $ curl -I 'https://doi.pangaea.de/10.1594/PANGAEA.944307' HTTP/2 200 server: nginx/1.21.6 date: Tue, 17 May 2022 22:20:09 GMT content-type: text/html;charset=utf-8 content-length: 49033 Path=/; Domain=.pangaea.de; Secure; HttpOnly vary: Cookie, Authorization, Accept cache-control: public x-cid: 46ac5408249e9724e81cb2964e712475 link: <https://doi.pangaea.de/10.1594/PANGAEA.944307>;rel="cite-as", <https://doi.pangaea.de/10.1594/PANGAEA.944307?format=zip>;rel="item";type="application/zip", <https://orcid.org/0000-0001-6414-6293>;rel="author", <https://orcid.org/0000-0002-8923-0827>;rel="author", <https://orcid.org/0000-0001-9823-1373>;rel="author", <https://orcid.org/0000-0002-6512-0770>;rel="author" ```bash $ curl -H 'Accept: application/ld+json' 'https://doi.pangaea.de/10.1594/PANGAEA.944307' | jq '.'

{ "@context": "http://schema.org/", "@type": "Dataset", "url": "https://doi.pangaea.de/10.1594/PANGAEA.944307", "creator": [ { "@type": "Person", "name": "Sergio Trias-Navarro", "familyName": "Trias-Navarro", "givenName": "Sergio", "email": "sergio.trias@unipa.it" }, { "@type": "Person", "name": "Maria de la Fuente", "familyName": "de la Fuente", "givenName": "Maria", "email": "mdelafuente@ub.edu" }, { "@id": "https://orcid.org/0000-0001-6414-6293", "@type": "Person", "name": "Leopoldo D Pena", "familyName": "Pena", "givenName": "Leopoldo D", "identifier": "https://orcid.org/0000-0001-6414-6293", "email": "lpena@ub.edu" }, { "@id": "https://orcid.org/0000-0002-8923-0827", "@type": "Person", "name": "Jaime Frigola", "familyName": "Frigola", "givenName": "Jaime", "identifier": "https://orcid.org/0000-0002-8923-0827", "email": "jfrigola@ub.edu" }, { "@id": "https://orcid.org/0000-0001-9823-1373", "@type": "Person", "name": "Antonio Caruso", "familyName": "Caruso", "givenName": "Antonio", "identifier": "https://orcid.org/0000-0001-9823-1373", "email": "antonio.caruso@unipa.it" }, { "@id": "https://orcid.org/0000-0002-6512-0770", "@type": "Person", "name": "Isabel Cacho", "familyName": "Cacho", "givenName": "Isabel", "identifier": "https://orcid.org/0000-0002-6512-0770", "email": "icacho@ub.edu" }, { "@type": "Person", "name": "Fabrizio Lirer", "familyName": "Lirer", "givenName": "Fabrizio", "email": "fabrizio.lirer@uniroma1.it" } ], "name": "Surface hydrology characterization at western flank of Sicily Channel during the last 15 kyr BP, through planktic foraminifera ecology, stable oxygen isotopes and elemental geochemical measurements", "publisher": { "@type": "Organization", "name": "PANGAEA", "disambiguatingDescription": "Data Publisher for Earth & Environmental Science", "url": "https://www.pangaea.de/" }, "includedInDataCatalog": { "@type": "DataCatalog", "name": "PANGAEA", "disambiguatingDescription": "Data Publisher for Earth & Environmental Science", "url": "https://www.pangaea.de/" }, "datePublished": "2022-05-16", "description": "In this study, we present a new detailed characterization of past surface hydrography in the western edge of the Sicily channel in order to identify potential variations in the water exchange between the western and eastern Mediterranean sub-basins through the Sicily channel. For this purpose, we use a sediment core currently located in the main pathway of the Modified Atlantic Surface Water (MAW) towards the Strait of Sicily. Here we present a multi-proxy approach combining planktic foraminifera ecology with δ18O records of Globigerina bulloides as well as Globigerinoides ruber and with elemental geochemical measurements as Ti/Al, K/Al, Ba/Ti.", "abstract": "In this study, we present a new detailed characterization of past surface hydrography in the western edge of the Sicily channel in order to identify potential variations in the water exchange between the western and eastern Mediterranean sub-basins through the Sicily channel. For this purpose, we use a sediment core currently located in the main pathway of the Modified Atlantic Surface Water (MAW) towards the Strait of Sicily. Here we present a multi-proxy approach combining planktic foraminifera ecology with δ18O records of Globigerina bulloides as well as Globigerinoides ruber and with elemental geochemical measurements as Ti/Al, K/Al, Ba/Ti.", "citation": { "@id": "https://doi.org/10.1016/j.gloplacha.2021.103582", "@type": [ "CreativeWork", "PublicationIssue" ], "identifier": "https://doi.org/10.1016/j.gloplacha.2021.103582", "url": "https://doi.org/10.1016/j.gloplacha.2021.103582", "creator": [ { "@type": "Person", "name": "Sergio Trias-Navarro", "familyName": "Trias-Navarro", "givenName": "Sergio", "email": "sergio.trias@unipa.it" }, { "@id": "https://orcid.org/0000-0002-6512-0770", "@type": "Person", "name": "Isabel Cacho", "familyName": "Cacho", "givenName": "Isabel", "identifier": "https://orcid.org/0000-0002-6512-0770", "email": "icacho@ub.edu" }, { "@type": "Person", "name": "Maria de la Fuente", "familyName": "de la Fuente", "givenName": "Maria", "email": "mdelafuente@ub.edu" }, { "@id": "https://orcid.org/0000-0001-6414-6293", "@type": "Person", "name": "Leopoldo D Pena", "familyName": "Pena", "givenName": "Leopoldo D", "identifier": "https://orcid.org/0000-0001-6414-6293", "email": "lpena@ub.edu" }, { "@id": "https://orcid.org/0000-0002-8923-0827", "@type": "Person", "name": "Jaime Frigola", "familyName": "Frigola", "givenName": "Jaime", "identifier": "https://orcid.org/0000-0002-8923-0827", "email": "jfrigola@ub.edu" }, { "@type": "Person", "name": "Fabrizio Lirer", "familyName": "Lirer", "givenName": "Fabrizio", "email": "fabrizio.lirer@uniroma1.it" }, { "@id": "https://orcid.org/0000-0001-9823-1373", "@type": "Person", "name": "Antonio Caruso", "familyName": "Caruso", "givenName": "Antonio", "identifier": "https://orcid.org/0000-0001-9823-1373", "email": "antonio.caruso@unipa.it" } ], "name": "Surface hydrographic changes at the western flank of the Sicily Channel associated with the last sapropel", "datePublished": "2021", "issueNumber": "204", "pagination": "103582", "isPartOf": { "@type": "CreativeWorkSeries", "name": "Global and Planetary Change" } }, "spatialCoverage": { "@type": "Place", "geo": { "@type": "GeoCoordinates", "latitude": 38.007388999999996, "longitude": 11.795789000000005 } }, "temporalCoverage": "2016-06-25T05:19:44", "inLanguage": "en", "conditionsOfAccess": "access rights needed", "isAccessibleForFree": false, "keywords": "elemental geochemistry; Mediterranean Sea; planktic foraminifera; Sicily Channel; stable oxygen isotopes", "size": { "@type": "QuantitativeValue", "value": 4, "unitText": "datasets" }, "distribution": { "@type": "DataDownload", "encodingFormat": "application/zip", "contentUrl": "https://doi.pangaea.de/10.1594/PANGAEA.944307?format=zip" } } ```

bash $ curl -H 'Accept: application/ld+json' 'https://scigraph.springernature.com/pub.10.1007/978-0-387-89976-3_10' { "@context": "https://springernature.github.io/scigraph/jsonld/sgcontext.json", "about": [ { "id": "http://purl.org/au-research/vocabulary/anzsrc-for/2008/08", "inDefinedTermSet": "http://purl.org/au-research/vocabulary/anzsrc-for/2008/", "name": "Information and Computing Sciences", "type": "DefinedTerm" }, { "id": "http://purl.org/au-research/vocabulary/anzsrc-for/2008/0806", "inDefinedTermSet": "http://purl.org/au-research/vocabulary/anzsrc-for/2008/", "name": "Information Systems", "type": "DefinedTerm" } ], "author": [ { "affiliation": { "alternateName": "Counseling, Educational, Psychology, and Special Education Department, Michigan State University, 461 Erickson Hall, 48824-1034, East Lansing, MI, USA", "id": "http://www.grid.ac/institutes/grid.17088.36", "name": [ "Counseling, Educational, Psychology, and Special Education Department, Michigan State University, 461 Erickson Hall, 48824-1034, East Lansing, MI, USA" ], "type": "Organization" }, "familyName": "Reckase", "givenName": "Mark D.", "id": "sg:person.01166264366.27", "sameAs": [ "https://app.dimensions.ai/discover/publication?and_facet_researcher=ur.01166264366.27" ], "type": "Person" } ], "datePublished": "2009-05-22", "datePublishedReg": "2009-05-22", "description": "Computerized adaptive testing (CAT) is a methodology for constructing a test, administering it to an examinee, and scoring the test using interactive computer technology. This methodology has a history that is as long as that of interactive computing. An early summary of CAT methods is given in Weiss (1974). A detailed description of the development of an operational application for the Armed Services Vocational Aptitude Battery is given in (Sands 1997). There are also several books available that describe the basic components of CAT procedures (Wainer, Dorans, Flaugher, Green, Mislevy, Steinberg and Thissen 1990; Parshall, Spray and Davey 2002; van der Linden and Glas 2000) so the basic details of the methodology are not presented here. A review of that literature will show that most of the current CAT methodology is based on the assumption that a unidimensional IRT model accurately represents the interaction between persons and test items. In this chapter, the generalization of the CAT methodology to the multidimensional case is considered. To provide a framework for this material, a brief summary of the conceptual basis for CAT is provided.", "genre": "chapter", "id": "sg:pub.10.1007/978-0-387-89976-3_10", "inLanguage": "en", "isAccessibleForFree": false, "isPartOf": { "isbn": [ "978-0-387-89975-6", "978-0-387-89976-3" ], "name": "Multidimensional Item Response Theory", "type": "Book" }, "keywords": [ "interactive computing", "computer technology", "interactive computer technology", "computerized adaptive testing", "Armed Services Vocational Aptitude Battery", "adaptive testing", "operational applications", "basic components", "computing", "unidimensional IRT model", "CAT methodology", "methodology", "test items", "IRT models", "CAT procedure", "technology", "basic details", "framework", "detailed description", "applications", "conceptual basis", "multidimensional case", "generalization", "testing", "examinees", "model", "items", "method", "description", "brief summary", "detail", "persons", "MIRT", "batteries", "test", "CAT method", "components", "assumption", "development", "chapter", "summary", "basis", "literature", "book", "procedure", "interaction", "Weiss", "cases", "review", "history", "materials", "Earlier summaries" ], "name": "Computerized Adaptive Testing Using MIRT", "pagination": "311-339", "productId": [ { "name": "dimensions_id", "type": "PropertyValue", "value": [ "pub.1046349288" ] }, { "name": "doi", "type": "PropertyValue", "value": [ "10.1007/978-0-387-89976-3_10" ] } ], "publisher": { "name": "Springer Nature", "type": "Organisation" }, "sameAs": [ "https://doi.org/10.1007/978-0-387-89976-3_10", "https://app.dimensions.ai/details/publication/pub.1046349288" ], "sdDataset": "chapters", "sdDatePublished": "2022-05-10T10:51", "sdLicense": "https://scigraph.springernature.com/explorer/license/", "sdPublisher": { "name": "Springer Nature - SN SciGraph project", "type": "Organization" }, "sdSource": "s3://com-springernature-scigraph/baseset/20220509/entities/gbq_results/chapter/chapter_412.jsonl", "type": "Chapter", "url": "https://doi.org/10.1007/978-0-387-89976-3_10" }

html The <a rel="cite" resource="http://www.legislation.gov.uk/id/ukpga/1999/17" href="http://en.wikipedia.org/wiki/Disability_Rights_Commission_Act_1999">Disability Rights Commission Act 1999</a> replaced the National Disability Council with the Disability Rights Commission (DRC). will generate the triple

<> xhv:cite <http://www.legislation.gov.uk/id/ukpga/1999/17>

```bash $ curl wttr.in Weather for City: Paris, France

 \   /     Clear
  .-.      10 – 11 °C

― ( ) ― ↑ 11 km/h<br /> `-’ 10 km<br /> / \ 0.0 mm<br /> ```

```html

<html prefix="dct: http://purl.org/dc/terms/ rdf: http://www.w3.org/1999/02/22-rdf-syntax-ns# dcat: http://www.w3.org/ns/dcat# foaf: http://xmlns.com/foaf/0.1/"> <head> <title>DCAT in RDFa</title> </head> <br /> <body> <div typeof="dcat:Dataset" resource="http://gov.example.org/dataset/finances">

Example DCAT Dataset

25th October 2010

10th March 2013

This is the description.

<div property="dct:license" resource="http://reference.data.gov.uk/id/open-government-licence"> <span property="dct:title">UK Open Government Licence (OGL)</span> </div> <div property="dct:publisher" resource="http://example.org/publisher"> <span property="foaf:name">Example Publisher</span> </div> <div> <span property="dcat:keyword">Examples</span>, <span property="dcat:keyword">DCAT</span> </div> <div> Weekly </div> <div property='dcat:distribution' typeof='dcat:Distribution'> <span property="dct:title">CSV download</span>

• Format <span content='text/csv' property='dcat:mediaType'>CSV</span>
• Size <span content='240585277' datatype='xsd:decimal' property='dcat:byteSize'>1024MB</span>
• Issues <span property='dct:issued'>2012-01-01</span>

Download the full dataset

</html> ```

xml <link href="https://circulation.librarysimplified.org/NYNYPL/annotations/Gutenberg%20ID/40278/" type="application/ld+json; profile=&quot;http://www.w3.org/ns/anno.jsonld&quot;" rel="http://www.w3.org/ns/oa#annotationService"/>

http HTTP/1.1 302 Found Server: Apache-Coyote/1.1 Vary: Accept Location: http://www.dlib.org/dlib/november15/vandesompel/11vandesompel.html Link: <http://orcid.org/0000-0002-0715-6126> ; rel="author", <http://orcid.org/0000-0003-3749-8116> ; rel="author" Expires: Tue, 31 May 2016 17:18:50 GMT Content-Type: text/html;charset=utf-8 Content-Length: 217 Date: Tue, 31 May 2016 16:38:15 GMT Connection: keep-alive

xml <link rel="related" type="application/atom+xml;profile=opds-catalog" title="theses.fr > Flux ATOM et OPDS des thèses accessibles en ligne" href="/?q=&sort=dateSoutenance+desc&access=oui&format=atom"/>

Example :

• Namespace declaration in the feed element (in our example, we use the prefix « pse » ):

xml <feed xmlns="http://www.w3.org/2005/Atom" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:pse="http://vaemendis.net/opds-pse/ns" xmlns:opds="http://opds-spec.org/2010/catalog" xml:lang="en" xmlns:opensearch="http://a9.com/-/spec/opensearch/1.1/" >

• Additional link in an entry to allow page by page access to the document :

xml <link rel="http://vaemendis.net/opds-pse/stream" type="image/jpeg" href="/opds-comics/stream/1217?page={pageNumber}&width={maxWidth}" pse:count="35" />

cito--cites--1375511 says “this article CiTO:cites article 137511”.

A CiTO citation network

json [ { "oci": "02001010806360107050663080702026306630509-0200101080636102703040309", "citing": "10.1186/1756-8722-6-59", "cited": "10.1186/ar3439", "creation": "2013", "timespan": "P2Y", "journal_sc": "no", "author_sc": "no" }, { "oci": "02001010806360107050663080702026306630509-0200101080636102704000806", "citing": "10.1186/1756-8722-6-59", "cited": "10.1186/ar4086", "creation": "2013", "timespan": "P1Y", "journal_sc": "no", "author_sc": "no" }, { "oci": "02001010806360107050663080702026306630509-020010200003619122437020001023704023707090006", "citing": "10.1186/1756-8722-6-59", "cited": "10.1200/jco.2012.42.7906", "creation": "2013", "timespan": "P0Y", "journal_sc": "no", "author_sc": "no" }, { "oci": "02001010806360107050663080702026306630509-02003010009360008080300010805370200010237060604070907", "citing": "10.1186/1756-8722-6-59", "cited": "10.3109/08830185.2012.664797", "creation": "2013", "timespan": "P0Y", "journal_sc": "no", "author_sc": "no" }

COCI, the OpenCitations Index of Crossref open DOI-to-DOI citations, is an RDF dataset containing details of all the citations that are specified by the open references to DOI-identified works present in Crossref, as of the latest COCI update*

[...]

Open Citation Identifiers

Each Open Citation Identifier [[OCI]] has a simple structure: the lower-case letters "oci" followed by a colon, followed by two numbers separated by a dash (e.g. https://w3id.org/oc/index/coci/ci/02001010806360107050663080702026306630509-02001010806360107050663080702026305630301), in which the first number identifies the citing work and the second number identifies the cited work.

|Prefix|Supplier|Identifier type|Example| |--- |--- |--- |--- | |010|Wikidata|Wikidata Identifier (QID)|oci:01027931310-01022252312| |020|Crossref|Digital Object Identifier (DOI)|oci:02001010806360107050663080702026306630509-02001010806360107050663080702026305630301| |030|OpenCitations Corpus|OpenCitations Corpus Internal Identifier|oci:0301-03018| |040|Dryad|Digital Object Identifier (DOI)|oci:040050006013613273410133708070900-04003070302361019113701000000040801| |050|CROCI|Digital Object Identifier (DOI)|oci:05001000106361937321411281422370200010237000837000001-050010008073602000009020002|

```html <link rel="alternate" type="application/opml+xml" title="Outline" href="https://www.openedition.org/?page=opml" />

<link rel="alternate" type="application/atom+xml;profile=opds-catalog" title="OpenEdition OPDS Catalogue" href="http://opds.openedition.org" /> ```