This is the last entry in this blog… A few days ago W3C started a new activity, called Data Activity, that also subsumes the (by now old) Semantic Web Activity. In order to have a fresh start, and to avoid confusion; a new blog has been set up for the Data Activity, replacing the current one (the RSS feed of that new blog can be accessed, too). Instead of giving a background for the new activity here, let me simply refer to the description given by Phil Archer, the new Activity lead. Meet you at the new blog!
The RDF Working Group has published two Proposed Recommendations today:
- JSON-LD 1.0. JSON is a useful data serialization and messaging format. This specification defines JSON-LD, a JSON-based format to serialize Linked Data. The syntax is designed to easily integrate into deployed systems that already use JSON, and provides a smooth upgrade path from JSON to JSON-LD. It is primarily intended to be a way to use Linked Data in Web-based programming environments, to build interoperable Web services, and to store Linked Data in JSON-based storage engines. Comments are welcome through 05 December.
- JSON-LD 1.0 Processing Algorithms and API. This specification defines a set of algorithms for programmatic transformations of JSON-LD documents. Restructuring data according to the defined transformations often dramatically simplifies its usage. Furthermore, this document proposes an Application Programming Interface (API) for developers implementing the specified algorithms. Comments are welcome through 05 December.
The RDF Working Group today published five Candidate Recommendations for version 1.1 of the Resource Description Framework (RDF), a widespread and stable technology for data interoperability:
- RDF 1.1 Concepts and Abstract Syntax defines the basics which underly all RDF syntaxes and systems. It provides for general data interoperability.
- RDF 1.1 Semantics defines the precise semantics of RDF data, supporting use with a wide range of “semantic” or “knowledge” technologies.
- RDF 1.1 N-Triples defines a simple line-oriented syntax for serializing RDF data. N-Triples is a minimalist subset of Turtle.
- RDF 1.1 TriG defines an extension to Turtle (aligned with SPARQL) for handling multiple RDF Graphs in a single document.
- RDF 1.1 N-Quads defines an extension to N-Triples for handling multiple RDF Graphs in a single document.
All of these technologies are now stable and ready to be widely implemented. Each specification (except Concepts) has an associated Test Suite and includes a link to an Implementation Report showing how various software currently fares on the tests. If you maintain RDF software, please review these specifications, update your software if necessary, and (if relevant) send in test results as explained in the Implementation Report.
RDF 1.1 is a refinement to the 2004 RDF specifications, designed to simplify and improve RDF without breaking existing deployments.
The W3C Germany and Austria office has published a report on the Multimedia Archives and Metadata for Digital Publishing September 2013 event, which was jointly held with Xinnovations. The metadata topic is covered in detail in the report and shows high relevance for a wide range of technologies – from Semantic Web to Digital Publishing and Web technology in general – and application areas: from general or scientific publishers and libraries to Wikipedia related communities. More information in German is provided by a dedicated press release.
W3C today published the final report of the Workshop on RDF Validation: Practical Assurances for Quality RDF Data that was held 10-11 September 2013 in Cambridge.
The goal of the Workshop was to identify use cases, requirements, and candidate technologies to address the need for interface definition and validation for RDF documents and messages. The 20 presentations focused on current and future requirements and solutions. Discussion sessions focused on consensus-building around scope and next steps.
This workshop laid the groundwork for W3C to develop a human and machine-readable description of the “shape” of the RDF graphs that a service produces or consumes. This description should be usable for validation, form-generation, as well as human-readable documentation. The participants further agreed that the solution must provide a declarative way of describing simple integrity constraints along with an extension mechanism that allows using technologies such as SPARQL to specify more complex constraints.
The Semantic Web Interest Group has published a new Working Draft of vCard Ontology. The document describes a mapping of the vCard specification (RFC6350) to RDF/OWL. The goal is to promote the use of vCard for the description of people and organizations utilizing semantic web techniques and allowing compatibility with traditional vCard implementations.
The W3C RDF Working Group has published a Last Call Working Draft of TriG. This document defines a textual syntax for RDF called TriG that allows an RDF dataset to be completely written in a compact and natural text form, with abbreviations for common usage patterns and datatypes. TriG is an extension of the Turtle format. Comments are welcome through 11 October.
The RDF Working Group and the JSON-LD Community Group published the Candidate Recommendation of JSON-LD 1.0, and JSON-LD 1.0 Processing Algorithms and API. This signals the beginning of the call for implementations for JSON-LD 1.0.
JSON-LD harmonizes the representation of Linked Data in JSON by describing a common JSON representation format for expressing directed graphs; mixing both Linked Data and non-Linked Data in a single document. The syntax is designed to not disturb already deployed systems running on JSON, but provide a smooth upgrade path from JSON to JSON-LD. It is primarily intended to be a way to use Linked Data in Web-based programming environments, to build interoperable Linked Data Web services, and to store Linked Data in JSON-based storage engines.
The W3C RDF Working Group has published two Last Call Working Drafts to line based, plain text formats to encode RDF Graphs and RDF Datasets: N-Triples and N-Quads, respectively. Comments are expected before the 14th of October.
The RDFa Working Group today published three RDFa Recommendations. RDFa lets authors put machine-readable data in HTML documents. Using RDFa, authors may turn their existing human-visible text and links into machine-readable data without repeating content. Today’s publications were:
- HTML+RDFa 1.1, which defines rules and guidelines for adapting the RDFa Core 1.1 and RDFa Lite 1.1 specifications for use in HTML5 and XHTML5. The rules defined in this specification not only apply to HTML5 documents in non-XML and XML mode, but also to HTML4 and XHTML documents interpreted through the HTML5 parsing rules.
- The group also published two Second Editions for RDFa Core 1.1 and XHTML+RDFa 1.1, folding in the errata reported by the community since their publication as Recommendations in June 2012; all changes were editorial.
上綱 秀治 (Shuji Kamitsuna) published a Japanese translation of the W3C document “SPARQL 1.1 Service Description” under the title “SPARQL 1.1サービス記述”, of the “SPARQL Query Results XML Format (2nd Edition)” under the title “SPARQLクエリ結果XMLフォーマット（第2版）”, and of the “SPARQL 1.1 Federated Query” under the title “SPARQL 1.1統合クエリ”.
上綱 秀治 (Shuji Kamitsuna) published a Japanese translation of the W3C document “SPARQL 1.1 Update” under the title “SPARQL 1.1更新”, and of the “SPARQL 1.1 Query Language” under the title “SPARQL 1.1クエリ言語”.
The Government Linked Data Working Group has published three Group Notes and a Last Call Working Draft today:
- Group Note of Use Cases and Lessons for the Data Cube Vocabulary. Many national, regional and local governments, as well as other organizations in- and outside of the public sector, collect numeric data and aggregate this data into statistics. There is a need to publish these statistics in a standardized, machine-readable way on the Web, so that they can be freely integrated and reused in consuming applications.
- Group Note of Registered Organization Vocabulary. The Registered Organization Vocabulary is a profile of the Organization Ontology for describing organizations that have gained legal entity status through a formal registration process, typically in a national or regional register.
- Group Note of Asset Description Metadata Schema (ADMS). ADMS is a profile of DCAT, used to describe semantic assets (or just ‘Assets’), defined as highly reusable metadata (e.g. xml schemata, generic data models) and reference data (e.g. code lists, taxonomies, dictionaries, vocabularies) that are used for eGovernment system development.
- Last Call Working Draft of Data Catalog Vocabulary (DCAT). DCAT is an RDF vocabulary designed to facilitate interoperability between data catalogs published on the Web. This document defines the schema and provides examples for its use. Comments are welcome through 30 August.
W3C has the pleasure to sponsor the Special Session on the Long-term Preservation and Governance of RDF Vocabularies, part of the DC-2013 conference in Lisbon, Portugal, on Tuesday, September 3, 2013. See also the Discussion paper for the special session, authored by Tom Baker, Bernard Vatant, and Pierre-Yves Vandenbussche.
The Linked Data Platform (LDP) Working Group has published a Last Call Working Draft of Linked Data Platform 1.0. This document describes a set of best practices and simple approach for a read-write Linked Data architecture, based on HTTP access to web resources that describe their state using the RDF data model. Comments are welcome through 02 September.
The W3C RDF Working Group has published two Last Call Working Drafts:
- A Last Call Working Draft of RDF 1.1 Concepts and Abstract Syntax. The Resource Description Framework (RDF) is a framework for representing information in the Web. Comments are welcome through 6 September.
- A Last Call Working Draft of RDF 1.1 Semantics. This document describes a precise semantics for the Resource Description Framework 1.1 and RDF Schema. It defines a number of distinct entailment regimes and corresponding patterns of entailment. It is part of a suite of documents which comprise the full specification of RDF 1.1. Comments are welcome through 6 September.
The W3C Government Linked Data Working Group has published a Group Note of Linked Data Glossary. This document is a glossary of terms defined and used to describe Linked Data, and its associated vocabularies and Best Practices. This document will help information management professionals, Web developers, scientists and the general public better understand publishing structured data using Linked Data Principles.
The W3C Government Linked Data (GLD) Working Group today published two Candidate Recommendations:
- The Organization Ontology (org) defines a vocabulary for describing the structure of an organization, such as a government agency or a corporation.
- The RDF Data Cube Vocabulary (data-cube) allows multi-dimensional data, such as statistics or environmental data, to be published on the Web in a standard way.
Each of these vocabularies is stable and has already been used in a variety of applications (see org implementations and data cube implementations). The group is now encouraging everyone who wants to provide or consume this kind of data to begin using these vocabularies, and it asks people to please send in reports of implementation experience, as explained in the documents. These reports will help us be sure the vocabularies are ready to become W3C Recommendations and generally help build global interoperability.