7 library(semweb/rdfa): Extract RDF from an HTML or XML DOM

See also

- http://www.w3.org/TR/2013/REC-rdfa-core-20130822/
- http://www.w3.org/TR/html-rdfa/

This module implements extraction of RDFa triples from parsed XML or HTML documents. It has two interfaces: read_rdfa/3 to read triples from some input (stream, file, URL) and xml_rdfa/3 to extract triples from an HTML or XML document that is already parsed with load_html/3 or load_xml/3.

[det]read_rdfa(+Input, -Triples, +Options)

True when Triples is a list of rdf(S,P,O) triples extracted from Input. Input is either a stream, a file name, a URL referencing a file name or a URL that is valid for http_open/3. Options are passed to open/4, http_open/3 and xml_rdfa/3. If no base is provided in Options, a base is deduced from Input.

xml_rdfa(+DOM, -RDF, +Options)

True when RDF is a list of rdf(S,P,O) terms extracted from DOM according to the RDFa specification. Options processed:

base(+BaseURI)

URI to use for ''. Normally set to the document URI.

anon_prefix(+AnnonPrefix)

Prefix for blank nodes.

lang(+Lang)

Default for lang

vocab(+Vocab)

Default for vocab

markup(+Markup)

Markup language processed (xhtml, xml, ...)

[multifile]rdf_db:rdf_load_stream(+Format, +Stream, :Options)

Register library(semweb/rdfa) as loader for HTML RDFa files.

To be done

Which options need to be forwarded to read_rdfa/3?