It also validates elements of commonly used namespaces: For Atom feeds, it validates against RFC 4287, which describes version 1.0 of the Atom feed format.(*) A document type is choosen when opening a document or creating a new one.The following table contains each menu detail with the supported document type.When a document type is mentionned, it means this menu item will be activated for this document type otherwise it will be disabled.The Extensible Markup Language (XML) is descriptively identified in the XML 1.0 W3C Recommendation as "an extremely simple dialect [or 'subset'] of SGML" the goal of which "is to enable generic SGML to be served, received, and processed on the Web in the way that is now possible with HTML," for which reason "XML has been designed for ease of implementation, and for interoperability with both SGML and HTML." Note that the "HTML" referenced in the preceding sentence (bis) means HTML 4.0 and 3.2 which were in common use as of 10-February-1998, when the XML 1.0 specification was published as a W3C Recommendation.The next version of 'HTML' is expected to be reformulated as an XML application, so that it will be based upon XML rather than upon SGML.When opening a document from the "Open recent" menu item or by opening a project from the "Open project" menu item, the document type is always restored. User cannot define a new document type but it is always possible to assign another document type for a template document from the "Template" menu and the "Edit templates" item.
These working groups were designed to have close liaison relationships with the W3C's Extensible Style[sheet] Language (XSL) Working Group and Document Object Model (DOM) Working Group.By construction, XML documents are conforming SGML documents." "XML is primarily intended to meet the requirements of large-scale Web content providers for industry-specific markup, vendor-neutral data exchange, media-independent publishing, one-on-one marketing, workflow management in collaborative authoring environments, and the processing of Web documents by intelligent clients.and provides a comprehensive suite of XML authoring and development tools.Despite its relatively simple nature, RSS is poorly implemented by many tools.This validator is an attempt to codify the specification (literally, to translate it into code) to make it easier to know when you're producing RSS correctly, and to help you fix it when you're not.It is designed to accommodate a large number of users, ranging from beginners to XML experts.