TL;DR: XHTML 1.0 as discussed by the authors is a reformulation of HTML 4 as an XML1.0 application, and three DTDs corresponding to the ones defined by HTML 4 are defined in the W3C Recommendation for HTML 4.
Abstract: This specification defines XHTML 1.0, a reformulation of HTML 4 as an XML 1.0 application, and three DTDs corresponding to the ones defined by HTML 4. The semantics of the elements and their attributes are defined in the W3C Recommendation for HTML 4. These semantics provide the foundation for future extensibility of XHTML. Compatibility with existing HTML user agents is possible by following a small set of guidelines.
TL;DR: The modern Web is made up of an enormous number of documents that have been created using HTML, which contain significant amounts of structured data, which is largely unavailable to tools and applications, when publishers can express this data more completely and tools can read it.
Abstract: The modern Web is made up of an enormous number of documents that have been created using HTML. These documents contain significant amounts of structured data, which is largely unavailable to tools and applications. When publishers can express this data more completely, and when tools can read it, a new world of user functionality becomes available, letting users transfer structured data between applications and web sites, and allowing browsing applications to improve the user experience: an event on a web page can be directly imported into a user’s desktop calendar; a license on a document can be detected so that users can be informed of
TL;DR: RDFauthor completely hides syntax as well as RDF and ontology data model difficulties from end users and allows to edit information on arbitrary RDFa-annotated web pages.
Abstract: In this paper we present RDFauthor, an approach for authoring information that adheres to the RDF data model. RDFauthor completely hides syntax as well as RDF and ontology data model difficulties from end users and allows to edit information on arbitrary RDFa-annotated web pages. RDFauthor extends RDFa with representations for provenance and update endpoint information. RDFauthor is based on extracting RDF triples from RDFa annotations and transforming the RDFa-annotated HTML view into an editable form by using a set of authoring widgets. As a result, every RDFa-annotated web page can be made easily writeable, even if information originates from different sources.