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Fwd: WebDataCommons releases 38.7 billion quads Microdata, Embedded JSON-LD, RDFa and Microformat data originating from 7.4 million pay-level-domains

From: Gray, Alasdair J G <A.J.G.Gray@hw.ac.uk>
Date: Fri, 12 Jan 2018 09:05:34 +0000
To: "public-bioschemas@w3.org" <public-bioschemas@w3.org>
Message-ID: <BE5F6F70-2460-4737-9D77-EE89B69C9E61@hw.ac.uk>
An interesting analysis of the markup available on the common crawl.


Begin forwarded message:

From: Anna Primpeli <anna@informatik.uni-mannheim.de<mailto:anna@informatik.uni-mannheim.de>>
Subject: WebDataCommons releases 38.7 billion quads Microdata, Embedded JSON-LD, RDFa and Microformat data originating from 7.4 million pay-level-domains
Date: 11 January 2018 at 09:35:20 GMT
To: <semantic-web@w3.org<mailto:semantic-web@w3.org>>, <public-schemaorg@w3.org<mailto:public-schemaorg@w3.org>>, <public-vocabs@w3.org<mailto:public-vocabs@w3.org>>
Resent-From: <semantic-web@w3.org<mailto:semantic-web@w3.org>>

Hi All,
we are happy to announce the new release of the WebDataCommons Microdata, JSON-LD, RDFa and Microformat data corpus.
The data has been extracted from the November 2017 version of the Common Crawl covering 3.2 billion HTML pages which originate from 26 million websites (pay-level domains).
In summary, we found structured data within 1.2 billion HTML pages out of the 3.2 billion pages contained in the crawl (38.9%). These pages originate from 7.4 million different pay-level domains out of the 26 million pay-level-domains covered by the crawl (28.4%).
Approximately 3.7 million of these websites use Microdata, 2.6 million websites use JSON-LD, and 1.2 million websites make use of RDFa. Microformats are used by more than 3.3 million websites within the crawl.


More and more websites annotate data describing for instance products, people, organizations, places, events, reviews, and cooking  recipes within their HTML pages using markup formats such as Microdata, embedded JSON-LD, RDFa and Microformat.

The WebDataCommons project extracts all Microdata, JSON-LD, RDFa, and Microformat data from the Common Crawl web corpus, the largest web corpus that is available to the public, and provides the extracted data for download. In addition, we publish statistics about the adoption of the different markup formats as well as the vocabularies that are used together with each format. We run yearly extractions since 2012 and we provide the dataset series as well as the related statistics at:

Statistics about the November 2017 Release:
Basic statistics about the November 2017 Microdata, JSON-LD, RDFa, and Microformat data sets as well as the vocabularies that are used together with each markup format are found at:


Markup Format Adoption
The page below provides an overview of the increase in the adoption of the different markup formats as well as widely used schema.org<http://schema.org/> classes from 2012 to 2017:

Comparing the statistics from the new 2017 release to the statistics about the October 2016 release of the data sets

we see that the adoption of structured data keeps on increasing while Microdata remains the most dominant markup syntax. The different nature of the crawling strategy that was used makes it hard to compare absolute as well as certain relative numbers between the two releases. More concretely, we observe that the November 2017 Common Crawl corpus is much deeper for certain domains like blogspot.com<http://blogspot.com/> and wordpress.com<http://wordpress.com/> while other domains are covered in a shallower way, with fewer URLs crawled in comparison to the October 2016 Common Crawl corpus. Nevertheless, it is clear that the growth rate of Microdata and Microformats is much higher than the one of RDFa and embedded JSON-LD.  Although, the latter format is widely spread, it is mainly used to annotate metadata for search actions (80% of the domains using JSON-LD) while only a few domains use it for annotating content information such as Organizations (25% of the domains using JSON-LD), Persons (4% of the domains using JSON-LD) or Offers (0.1% of the domains using JSON-LD).

Vocabulary Adoption
Concerning the vocabulary adoption, schema.org<http://schema.org/>, the vocabulary recommended by Google, Microsoft, Yahoo!, and Yandex continues to be the most dominant in the context of Microdata with 78% of the webmasters using it in comparison to its predecessor, the data-vocabulary, which is only used by 14% of the websites containing Microdata. In the context of RDFa, the Open Graph Protocol recommended by Facebook remains the most widely used vocabulary.

Parallel Usage of Multiple Formats
Analyzing topic-specific subsets, we discover some interesting trends. As observed in the previous extractions, content related information is mostly described either with the Microdata format or less frequently with the JSON-LD format, in both cases using the schema.org<http://schema.org/> vocabulary. However, we find out that 30% of the websites that use JSON-LD annotations to describe product related information, make use of Microdata as well as JSON-LD to cover the same topic. This is not the case for other topics, such as Hotels or Job Postings, for which webmasters use only one format to annotate their content.

Richer Descriptions of Job Postings
Following the release of the “Google for Jobs” search vertical and the more detailed guidance by Google on how to annotate job postings (https://developers.google.com/search/docs/data-types/job-posting), we see an increase in the number of websites annotating job postings (2017: 7,023, 2016: 6,352). In addition, the job posting annotations tend to become richer in comparison to the previous years as the number of Job Posting related properties adopted by at least 30% of the websites containing job offers has increased from 4 (2016) to 7 (2017). The newly adopted properties are JobPosting/url, JobPosting/datePosted, and JobPosting/employmentType.
You can find a more extended analysis concerning specific topics, like Job Posting and Product, here

The overall size of the November 2017 RDFa, Microdata, Embedded JSON-LD and Microformat data sets is 38.7 billion RDF quads. For download, we split the data into 8,433 files with a total size of 858 GB.

In addition, we have created for over 40 different schema.org<http://schema.org/> classes separate files, including all quads extracted from pages, using a specific schema.org<http://schema.org/> class.


Lots of thanks to:

+ the Common Crawl project for providing their great web crawl and thus enabling the WebDataCommons project.
+ the Any23 project for providing their great library of structured data parsers.
+ Amazon Web Services in Education Grant for supporting WebDataCommons.
+ the Ministry of Economy, Research and Arts of Baden – Württemberg which supported through the ViCE project the extraction and analysis of the November 2017 corpus.

General Information about the WebDataCommons Project
The WebDataCommons project extracts structured data from the Common Crawl, the largest web corpus available to the public, and provides the extracted data for public download in order to support researchers and companies in exploiting the wealth of information that is available on the Web. Beside of the yearly extractions of semantic annotations from webpages, the WebDataCommons project also provides large hyperlink graphs, the largest public corpus of WebTables, a corpus of product data, as well as a collection of hypernyms extracted from billions of web pages for public download. General information about the WebDataCommons project is found at

Have fun with the new data set.

Anna Primpeli, Robert Meusel and Chris Bizer

Alasdair J G Gray
Fellow of the Higher Education Academy
Assistant Professor in Computer Science,
School of Mathematical and Computer Sciences
(Athena SWAN Bronze Award)
Heriot-Watt University, Edinburgh UK.

Email: A.J.G.Gray@hw.ac.uk<mailto:A.J.G.Gray@hw.ac.uk>
Web: http://www.macs.hw.ac.uk/~ajg33
ORCID: http://orcid.org/0000-0002-5711-4872
Office: Earl Mountbatten Building 1.39
Twitter: @gray_alasdair


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Received on Friday, 12 January 2018 09:06:03 UTC

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