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W3C Markup Validation Service. The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition. Markup validation is an important step towards ensuring the technical quality of web pages.
Help:Markup validation. The W3C Markup Validation Service lets editors check web pages for conformance to HTML and XHTML standards. It is helpful for catching minor problems such as duplicate section names or citation IDs. Although most major browsers will tolerate many of the errors, and will display a document successfully even if it contains ...
XSD ( XML Schema Definition ), a recommendation of the World Wide Web Consortium ( W3C ), specifies how to formally describe the elements in an Extensible Markup Language ( XML) document. It can be used by programmers to verify each piece of item content in a document, to assure it adheres to the description of the element it is placed in. [1]
SHACL (W3C Technical Recommendation) is the main document, defining the features of SHACL Core and its extension mechanism called SHACL-SPARQL. SHACL Core defines the basic syntax and structure of shapes, constraints, the built-in kinds of constraints, and how to link shapes to data nodes.
Of the two serializations, the W3C suggests that most authors use the HTML syntax, rather than the XHTML syntax. The W3C recommendations of both XHTML 1.0 and XHTML 1.1 were retired on 27 March 2018, along with HTML 4.0, HTML 4.01, and HTML5. Motivation
Turtle (syntax) In computing, Terse RDF Triple Language ( Turtle) is a syntax and file format for expressing data in the Resource Description Framework (RDF) data model. Turtle syntax is similar to that of SPARQL, an RDF query language. It is a common data format for storing RDF data, along with N-Triples, JSON-LD and RDF/XML .
The CSS specifications are maintained by the World Wide Web Consortium (W3C). Internet media type text/css is registered for use with CSS by RFC 2318 (March 1998). The W3C operates a free CSS validation service for CSS documents. In addition to HTML, other markup languages support the use of CSS including XHTML, plain XML, SVG, and XUL.
HTML5 ( Hypertext Markup Language 5) is a markup language used for structuring and presenting hypertext documents on the World Wide Web. It was the fifth and final [4] major HTML version that is now a retired World Wide Web Consortium (W3C) recommendation. The current specification is known as the HTML Living Standard.