NAME

RDF::RDFa::Parser::Config - configuration sets for RDFa parser

DESCRIPTION

The third argument to the constructor for RDF::RDFa::Parser objects is a configuration set. This module provides such configuration sets.

Confguration sets are needed by the parser so that it knows how to handle certain features which vary between different host languages, or different RDFa versions.

All you need to know about is the constructor:

  $config = RDF::RDFa::Parser::Config->new($host, $version, %options);

$host is the host language. Generally you would supply one of the following constants; the default is HOST_XHTML. Internet media types are accepted (e.g. 'text/html' or 'image/svg+xml'), but it's usually better to use a constant as some media types are shared (e.g. HTML4 and HTML5 both use the same media type).

RDF::RDFa::Parser::Config->HOST_ATOM
RDF::RDFa::Parser::Config->HOST_DATARSS
RDF::RDFa::Parser::Config->HOST_HTML32
RDF::RDFa::Parser::Config->HOST_HTML4
RDF::RDFa::Parser::Config->HOST_HTML5
RDF::RDFa::Parser::Config->HOST_OPENDOCUMENT_XML (Flat XML: "FODT", "FODS", etc)
RDF::RDFa::Parser::Config->HOST_OPENDOCUMENT_ZIP ("ODT", "ODS", etc)
RDF::RDFa::Parser::Config->HOST_SVG
RDF::RDFa::Parser::Config->HOST_XHTML
RDF::RDFa::Parser::Config->HOST_XHTML5
RDF::RDFa::Parser::Config->HOST_XML

$version is the RDFa version. Generally you would supply one of the following constants; the default is RDFA_LATEST.

RDF::RDFa::Parser::Config->RDFA_10
RDF::RDFa::Parser::Config->RDFA_11
RDF::RDFa::Parser::Config->RDFA_GUESS
RDF::RDFa::Parser::Config->RDFA_LATEST

Version guessing: the root element is inspected for an attribute 'version'. If this exists and matches /\bRDFa\s+(\d+\.\d+)\b/i then that is used as the version. Otherwise, the latest version is assumed.

%options is a hash of additional options to use which override the defaults. While many of these are useful, they probably also reduce conformance to the official RDFa specifications. The following options exist; defaults for XHTML+RDFa1.0 and XHTML+RDFa1.1 are shown in brackets.

alt_stylesheet - magic rel="alternate stylesheet". [0]
atom_elements - process <feed> and <entry> specially. [0]
atom_parser - extract Atom 1.0 native semantics. [0]
auto_config - see section "Auto Config" [0]
bookmark_start, bookmark_end, bookmark_name - Elements to treat like OpenDocument's <text:bookmark-start> and <text:bookmark-end> element, and associated text:name attribute. Must set all three to use this feature. Use Clark Notation to specify namespaces. [all undef]
cite_attr - support @cite [0]
datetime_attr - support @datetime attribute and HTML5 <time> element. [0]
default_profiles - THIS OPTION IS NO LONGER SUPPORTED!
dom_parser - parser to use to turn a markup string into a DOM. 'html', 'opendocument' (i.e. zipped XML) or 'xml'. ['xml']
embedded_rdfxml - find plain RDF/XML chunks within document. 0=no, 1=handle, 2=skip. [0]
full_uris - support full URIs in CURIE-only attributes. [0, 1]
graph - enable support for named graphs. [0]
graph_attr - attribute to use for named graphs. Use Clark Notation to specify a namespace. ['graph']
graph_type - graph attribute behaviour ('id' or 'about'). ['about']
graph_default - default graph name. [undef]
initial_context - space-separated list of URIs, which must be keys in %RDF::RDFa::Parser::InitialContext::Known [?]
inlist_attr - support @inlist. [0, 1]
longdesc_attr - support @longdesc [0]
lwp_ua - an LWP::UserAgent to use for HTTP requests. [undef]
ns - namespace for RDFa attributes. [undef]
prefix_attr - support @prefix rather than just @xmlns:*. [0, 1]
prefix_bare - support CURIEs with no colon+suffix. [0]
prefix_default - URI for default prefix (e.g. rel=":foo"). ['http://www.w3.org/1999/xhtml/vocab#']
prefix_nocase - DEPRECATED - shortcut for prefix_nocase_attr and prefix_nocase_xmlns.
prefix_nocase_attr - ignore case-sensitivity of CURIE prefixes defined via @prefix attribute. [0, 1]
prefix_nocase_xmlns - ignore case-sensitivity of CURIE prefixes defined via xmlns. [0, 1]
profile_attr - THIS OPTION IS NO LONGER SUPPORTED!
profile_pi - THIS OPTION IS NO LONGER SUPPORTED!
property_resources - @property works for resources [0, 1]
role_attr - support for XHTML @role [0]
safe_anywhere - allow Safe CURIEs in @rel/@rev/etc. [0, 1]
safe_optional - allow Unsafe CURIEs in @about/@resource. [0, 1]
skolemize - mint URIs instead of blank node identifiers. [0]
src_sets_object - @src sets object URI (like @href) [0, 1]
tdb_service - use thing-described-by.org to name some bnodes. [0]
typeof_resources - allow @typeof to occasionally apply to objects rather than subjects. [0, 1]
user_agent - a User-Agent header to use for HTTP requests. Ignored if lwp_ua is provided. [undef]
use_rtnlx - use RDF::Trine::Node::Literal::XML. 0=no, 1=if available. [0]
value_attr - support @value attribute (like @content) [0]
vocab_attr - support @vocab from RDFa 1.1. [0, 1]
vocab_default - default vocab URI (e.g. rel="foo"). [undef]
vocab_triple - generate triple from @vocab. [0, 1]
xhtml_base - process <base> element. 0=no, 1=yes, 2=use it for RDF/XML too. [1]
xhtml_elements - process <head> and <body> specially. (Different special handling for XHTML+RDFa 1.0 and 1.1.) [1, 2]
xhtml_lang - support @lang rather than just @xml:lang. [0]
xml_base - support for 'xml:base' attribute. 0=only RDF/XML; 1=except @href/@src; 2=always. [0]
xml_lang - Support for 'xml:lang' attribute. [1]
xmllit_default - Generate XMLLiterals enthusiastically. [1, 0]
xmllit_recurse - Look for RDFa inside XMLLiterals. [0, 1]
xmlns_attr - Support for 'xmlns:foo' to define CURIE prefixes. [1]

An alternative constructor "tagsoup" is provided with a useful set of options for dealing with content "from the wild".

EXAMPLES

The following full example parses RDFa 1.1 in an Atom document, also using the non-default 'atom_parser' option which parses native Atom elements into the graph too.

  use RDF::RDFa::Parser;
  
  $config = RDF::RDFa::Parser::Config->new(
    RDF::RDFa::Parser::Config->HOST_ATOM,
    RDF::RDFa::Parser::Config->RDFA_11,
    atom_parser => 1,
    );
  $parser = RDF::RDFa::Parser->new_from_url($url, $config);
  $data   = $parser->graph;

The following configuration set parses XHTML+RDFa 1.1 while also parsing any RDF/XML chunks that are embedded in the document.

  use RDF::RDFa::Parser::Config qw(HOST_XHTML RDFA_11);
  $config = RDF::RDFa::Parser::Config->new(
    HOST_XHTML, RDFA_11, embedded_rdfxml=>1);
  $parser = RDF::RDFa::Parser->new_from_url($url, $config);
  $data   = $parser->graph;

The following config is good for dealing with (X)HTML content from the wild:

  $config = RDF::RDFa::Parser::Config->tagsoup;
  $parser = RDF::RDFa::Parser->new_from_url($url, $config);
  $data   = $parser->graph;

AUTHOR

Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

DISCLAIMER OF WARRANTIES