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.\" ========================================================================
.\"
.IX Title "RDF::Redland::Node 3pm"
.TH RDF::Redland::Node 3pm 2024-03-17 "perl v5.38.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH NAME
RDF::Redland::Node \- Redland RDF Node (RDF Resource, Property, Literal) Class
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 4
\&  use RDF::Redland;
\&  my $node1=new RDF::Redland::Node("Hello, World!");
\&  my $node2=new RDF::Redland::Node($uri); # $uri is an RDF::Redland::URI
\&  my $node3=$node2\->clone;
\&
\&  my $node4=new RDF::Redland::URINode("http://example.com/");
\&  my $node5=new RDF::Redland::LiteralNode("Hello, World!");
\&  my $node6=new RDF::Redland::XMLLiteral("<tag>content</tag>");
\&  my $node7=new RDF::Redland::BlankNode("genid1");
\&
\&  # alternate more verbose ways:
\&  my $node4=RDF::Redland::Node\->new_from_uri("http://example.com/");
\&  my $node5=RDF::Redland::Node\->new_literal("Hello, World!");
\&  my $node6=RDF::Redland::Node\->new_xml_literal("<tag>content</tag>");
\&  my $node7=RDF::Redland::Node\->new_from_blank_identifier("genid1");
\&  ...
\&
\&  print $node4\->uri\->as_string,"\en";  # Using RDF::Redland::URI::as_string
\&  print $node5\->literal_value_as_latin1,"\en";
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
This class represents RDF URIs, literals and blank nodes in the RDF graph.
.SH CONSTRUCTORS
.IX Header "CONSTRUCTORS"
.IP "new [STRING | URI | NODE]" 4
.IX Item "new [STRING | URI | NODE]"
Create a new URI node, literal node or copy an existing node.
.Sp
If a literal \fISTRING\fR is given, make a plain literal node.  If a
the argument is of type \fIURI\fR (perl URI or RDF::Redland::URI),
make a resource node.
.Sp
Otherwise if the argument is an RDF::Redland::Node \fINODE\fR, copy it.
.IP "new_from_uri URI" 4
.IX Item "new_from_uri URI"
Create a new URI node.  \fIURI\fR can be either a RDF::Redland::URI
object, a perl URI class or a literal string.
.Sp
An alternative is:
.Sp
.Vb 1
\&  new RDF::Redland::URINode("http://example.org/");
.Ve
.IP "new_literal STRING [DATATYPE [XML_LANGUAGE]]" 4
.IX Item "new_literal STRING [DATATYPE [XML_LANGUAGE]]"
Create a new literal node for a literal value \fISTRING\fR.
Optional datatype URI \fIDATATYPE\fR (RDF::Redland::URI, perl URI or string)
and language (xml:lang attribute) \fIXML_LANGUAGE\fR may also be given.
.Sp
An alternative is:
.Sp
.Vb 2
\&   new RDF::Redland::LiteralNode("Hello, World!");
\&   new RDF::Redland::LiteralNode("Bonjour monde!", undef, "fr");
.Ve
.IP "new_xml_literal STRING" 4
.IX Item "new_xml_literal STRING"
Create a new XML datatyped literal node for the XML in \fISTRING\fR.
.Sp
An alternative is:
.Sp
.Vb 1
\&  new RDF::Redland::XMLLiteral("<tag>content</tag>");
.Ve
.IP "new_from_blank_identifier IDENTIFIER" 4
.IX Item "new_from_blank_identifier IDENTIFIER"
Create a new blank node with blank node identifier \fIIDENTIFIER\fR.
.Sp
An alternative is:
.Sp
.Vb 1
\&  new RDF::Redland::BlankNode("id");
.Ve
.IP clone 4
.IX Item "clone"
Copy a RDF::Redland::Node.
.SH METHODS
.IX Header "METHODS"
.IP uri 4
.IX Item "uri"
Get the current URI of the node as an RDF::Redland::URI object.
.IP blank_identifier 4
.IX Item "blank_identifier"
Get the current blank identifier of the node
.IP type 4
.IX Item "type"
Get the node type.  It is recommended to use the is_resource, is_literal
or is_blank methods in preference to this (both simpler and quicker).
.Sp
The current list of types that are supported are:
.Sp
.Vb 3
\&  $RDF::Redland::Node::Type_Resource
\&  $RDF::Redland::Node::Type_Literal
\&  $RDF::Redland::Node::Type_Blank
.Ve
.Sp
Example:
.Sp
.Vb 5
\&  if ($node\->type == $RDF::Redland::Node::Type_Resource) {
\&    print "Node is a resource with URI ", $node\->uri\->as_string, "\en";
\&  } else {
\&    ...
\&  }
.Ve
.IP is_resource 4
.IX Item "is_resource"
Return true if node is a resource (with a URI)
.IP is_literal 4
.IX Item "is_literal"
Return true if node is a literal
.IP is_blank 4
.IX Item "is_blank"
Return true if node is a blank nodeID
.IP literal_value 4
.IX Item "literal_value"
Get the node literal value string as UTF\-8 (when the node is of type
\&\f(CW$RDF::Redland::Node::Type_Literal\fR)
.IP literal_value_as_latin1 4
.IX Item "literal_value_as_latin1"
Get the node literal value string converted from UTF\-8 to ISO Latin\-1
(when the node is of type \f(CW$RDF::Redland::Node::Type_Literal\fR)
.IP literal_value_language 4
.IX Item "literal_value_language"
Get the node literal XML language (when the node is of type
\&\f(CW$RDF::Redland::Node::Type_Literal\fR) or undef if not present.
.IP literal_value_is_wf_xml 4
.IX Item "literal_value_is_wf_xml"
Return non 0 if the literal string is well formed XML (when the node
is of type \f(CW$RDF::Redland::Node::Type_Literal\fR).
.IP literal_datatype 4
.IX Item "literal_datatype"
Return the RDF::Redland::URI of the literal datatype or undef if it
is not a datatype.
.IP as_string 4
.IX Item "as_string"
Return the RDF::Redland::Node formatted as a string (UTF\-8 encoded).
.IP "equals NODE" 4
.IX Item "equals NODE"
Return non zero if this node is equal to NODE
.SH "OLDER METHODS"
.IX Header "OLDER METHODS"
.IP "new_from_literal STRING XML_LANGUAGE IS_WF" 4
.IX Item "new_from_literal STRING XML_LANGUAGE IS_WF"
Create a new RDF::Redland::Node object for a literal value \fISTRING\fR with XML
language (xml:lang attribute) \fIXML_LANGUAGE\fR
and if content is well formed XML, when \fIIS_WF\fR is non
0.  \fIXML_LANGUAGE\fR is optional can can be set to undef.
.Sp
This method remains but using new_literal is preferred.
Instead, for plain literals use:
.Sp
.Vb 1
\&  $node=new RDF::Redland::Node("blah")
.Ve
.IP "new_from_typed_literal STRING [DATATYPE [XML_LANGUAGE]]" 4
.IX Item "new_from_typed_literal STRING [DATATYPE [XML_LANGUAGE]]"
Renamed to new_literal with same arguments.
.IP "new_from_uri_string URI_STRING" 4
.IX Item "new_from_uri_string URI_STRING"
Create a new RDF::Redland::Node object for a resource with URI \fIURI_STRING\fR.
It is equivalent to use the shorter:
.Sp
.Vb 1
\&  $a=new RDF::Redland::Node\->new_from_uri($uri_string)
.Ve
.IP "new_from_node NODE" 4
.IX Item "new_from_node NODE"
Create a new RDF::Redland::Node object from existing
RDF::Redland::Node \fINODE\fR (copy constructor).
It is equivalent to use:
.Sp
.Vb 1
\&  $new_node=$old_node\->clone
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
RDF::Redland::Statement
.SH AUTHOR
.IX Header "AUTHOR"
Dave Beckett \- http://www.dajobe.org/