NAME

       RDF::aREF::Decoder - decode another RDF Encoding Form (to RDF triples)

SYNOPSIS

           use RDF::aREF::Decoder;

           RDF::aREF::Decoder->new( %options )->decode( $aref );

DESCRIPTION

       This module implements a decoder from another RDF Encoding Form (aREF), given as in form
       of Perl arrays, hashes, and Unicode strings, to RDF triples.

OPTIONS

   ns
       A default namespace map, given either as hash reference or as version string of module
       RDF::NS. Set to the most recent version of RDF::NS by default, but relying on a default
       value is not recommended!

   callback
       A code reference that is called for each triple with a list of three to five elements:

       subject
           The subject IRI or subject blank node as string. Blank nodes always start with "_:".

       predicate
           The predicate IRI.

       object
           The object IRI or object blank node or literal object as string. Blank nodes always
           start with "_:" and literal objects can be detected by existence of the (possibly
           empty) language or datatype element.

       language
           The language tag (possible the empty string) for literal objects.

       datatype
           The object's datatype if object is a literal and datatype is not
           "http://www.w3.org/2001/XMLSchema#string".

       For convenience an instance of RDF::Trine::Model can also be used as callback.

   complain
       What to do on errors. Set to 1 be default (warn). Set to 0 to ignore. Other values will
       die on errors.

   strict
       Enables errors on undefined subjects, predicates, and objects. By default the Perl value
       "undef" in any part of an encoded RDF triple will silently ignore the triple, so aREF
       structures can easily be used as templates with optional values.

   null
       A null object that is treated equivalent to "undef" if found as object.  For instance
       setting this to the empty string will ignore all triples with the empty string as literal
       value.

   bnode_prefix
       A prefix for blank node identifiers. Defaults to "b", so blank node identifiers will be
       "b1", "b2", "b3" etc.

   bnode_count
       An integer to start creating blank node identifiers with. The default value "0" results in
       blank node identifiers starting from "b1". This option can be useful to avoid collision of
       blank node identifiers when merging multiple aREF instances. The current counter value is
       accessible as accessor.

METHODS

   decode( $aref [, keep_bnode_map => 1 ] )
       Encode RDF data given in aREF. Resets all blank node identifier mappings unless option
       c<keep_bnode_map> is set.

   clean_bnodes
       Delete blank node identifier mapping and reset bnode_count.

EXPORTABLE CONSTANTS

       On request this module exports the following regular expressions, as defined in the aREF
       specification <http://gbv.github.io/aREF/aREF.html>:

       qName
       blankNode
       IRIlike
       languageString
       languageTag
       datatypeString

SEE ALSO

       RDF::aREF::Encoder