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rdfa.pl -- Extract RDF from an HTML or XML DOM
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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.

See also
- http://www.w3.org/TR/2013/REC-rdfa-core-20130822/
- http://www.w3.org/TR/html-rdfa/
Source read_rdfa(+Input, -Triples, +Options) is det
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.
Source 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:
URI to use for ''. Normally set to the document URI.
Prefix for blank nodes.
Default for lang
Default for vocab
Markup language processed (xhtml, xml, ...)
Source rdf_db:rdf_load_stream(+Format, +Stream, :Options)[multifile]
Register library(semweb/rdfa) as loader for HTML RDFa files.
To be done
- Which options need to be forwarded to read_rdfa/3?