The Spatial Data on the Web Working Group has published a Working Draft of Semantic Sensor Network Ontology. The Semantic Sensor Network Ontology (commonly known as “SSN” or sometimes “SSNO”) is an OWL-2 DL ontology for describing sensors and the observations they make of the physical world. SSN is published in a modular architecture that supports the judicious use of “just enough” ontology for diverse applications, including satellite imagery, large scale scientific monitoring, industrial and household infrastructure, citizen observers, and Web of Things. SSN is described and examples of its use are given.
The Web Authentication Working Group has published a Working Draft of Web Authentication: A Web API for accessing scoped credentials. This specification defines an API that enables web pages to access WebAuthn compliant strong cryptographic credentials through browser script. Conceptually, one or more credentials are stored on an authenticator, and each credential is scoped to a single Relying Party. Authenticators are responsible for ensuring that no operation is performed without the user’s consent. The user agent mediates access to credentials in order to preserve user privacy. Authenticators use attestation to provide cryptographic proof of their properties to the relying party. This specification also describes a functional model of a WebAuthn compliant authenticator, including its signature and attestation functionality.
W3C is pleased to announce the selection of Web Science Institute at the University of Southampton, to host UK & Ireland Office. The W3C United Kingdom and Ireland Office will be staffed by Susan Davies, Coordination Manager for the WSI, who will become the Office Manager, and Professor Leslie Carr, Director of the WSI Centre for Doctoral Training, who will act in a Senior Advisor role. W3C Offices act as local points of contact for W3C work and help ensure that W3C and its specifications reach an international audience. Professor Dame Wendy Hall, Executive Director of the WSI commented, “The WSI is excited to be taking on this important role within the W3C. The University of Southampton has played an active role in the Web community since 1994 and has been a member of the W3C since 1998, promoting new futures of the Web through W3C community groups including the Web Observatory, Annotations and Web of Things.” Read more in our press release, and learn more about the W3C Offices program.
The Cascading Style Sheets (CSS) Working Group invites implementation of the Candidate Recommendation of CSS Flexible Box Layout Module Level 1. The specification describes a CSS box model optimized for user interface design. In the flex layout model, the children of a flex container can be laid out in any direction, and can “flex” their sizes, either growing to fill unused space or shrinking to avoid overflowing the parent. Both horizontal and vertical alignment of the children can be easily manipulated. Nesting of these boxes (horizontal inside vertical, or vertical inside horizontal) can be used to build layouts in two dimensions.
W3C has published new global guidelines, TTML Profiles for Internet Media Subtitles and Captions 1.0 IMSC1 as a W3C Recommendation, that will improve accessibility and make it easier and less expensive for distributors of online video content to deliver subtitles and closed captions worldwide.
An application of the W3C’s Emmy® award-winning Timed Text Markup Language (TTML), TTML Profiles for IMSC1 simplifies authoring and processing of subtitles and captions worldwide by harmonizing popular profiles of TTML. In addition, W3C’s TTML Working Group updated the working draft of TTML 2, the second version of Timed Text Markup Language (TTML), which adds features introduced in IMSC1 as well as other improvements, such as additional support for East Asian language typography, stereoscopic presentations, and mapping to HTML and CSS.
Described as a harmonization point for subtitling practices around the world, the IMSC1 global standard helps to bring together standards, rather than creating further fragmentation. Compatible with common media container formats, IMSC1 integrates with existing workflows, content libraries, and captioning requirements by offering conversion from popular captioning formats. You may read more in the press release.
The W3C Social Web Working Group is calling for implementations of Webmention, which is now a Candidate Recommendation. Webmention provides a mechanism for a website to notify other websites that it has content which links to them and when the source content changes or is deleted. This mechanism is a core building block for a decentralized (social) Web because it allows sites to automatically learn about connected content without any prior setup or agreement. For users, an immediate benefit is cross-site comments. Before being brought to W3C for standardization, Webmention already had twenty-seven independent implementations in the IndieWebCamp community.
The Data on the Web Best Practices Working Group has published three documents for which reviews are actively sought.
The Data on the Web Best Practices document offers advice on how data of all kinds – government, research, commercial – can be shared on the Web, whether openly or not. The underlying aim is to make data intelligently available, maximizing the likelihood of its discovery and reuse. The provision of a variety of metadata, the use of URIs as identifiers and multiple access options are key to this. The Working Group believes that the document is now complete and is seeking review before the transition to Candidate Recommendation (call for implementations).
Two new vocabularies accompany the Best Practices document:
The Dataset Usage Vocabulary offers a framework in which citations, comments, and uses of data within applications can be structured. The aim is to benefit data publishers by enabling assessment of the impact of their efforts to share data, and to benefit data users by encouraging the continued availability of data and the visibility of their own work that uses it.
The Data Quality Vocabulary is a framework in which the quality of a dataset can be described, whether by the dataset publisher or by a broader community of users. It does not provide a formal, complete definition of quality, rather, it sets out a consistent means by which information can be provided such that a potential user of a dataset can make his/her own judgment about its fitness for purpose.
The vocabularies are seen as mature and the Working Group is seeking one last round of feedback to enable them to be published as Working Group Notes in the near future.
The Cascading Style Sheets (CSS) Working Group invites implementation of the Candidate Recommendation of CSS Cascading and Inheritance Level 3. One of the fundamental design principles of CSS is cascading, which allows several style sheets to influence the presentation of a document. When different declarations try to set a value for the same element/property combination, the conflicts must somehow be resolved.
The WAI Education and Outreach Working Group (EOWG) has posted the first version of Web Accessibility Perspectives that explores the impact of accessibility for people with disabilities and the benefits for everyone. This resource introduces 10 web accessibility topics with short videos, brief descriptions, and links to learn more. The videos relate the benefits of accessibility to everyone in different situations, and encourage viewers to learn more about web accessibility. Read about the Web Accessibility Initiative (WAI).