Embedded RDF (eRDF) is a syntax for writing HTML in such a way that the information in the HTML document can be extracted (with an eRDF parser or XSLT style sheet) into Resource Description Framework (RDF). This can be of great use for searching within data.
It was invented by Ian Davis in 2005, and partly inspired by microformats, a simplified approach to semantically annotate data in websites. This specification is obsolete, superseded by RDFa, Microdata, and JSON-LD.
- RDFa, W3C's approach at embedding RDF within HTML
- JSON-LD, W3C's approach at embedding RDF within HTML in the form of JSON snippets
- GRDDL, a way to extract (annotated) data out of XHTML and XML documents and transform it into an RDF graph
- Microdata (HTML), another approach at embedding semantics in HTML using additional attributes.
- microformats, the most common way of embedding additional semantics in HTML.