RDF::KV::Patch - Representation of RDF statements to be added or removed
my $patch = RDF::KV::Patch->new; $patch->add_this($s, $p, $o, $g); $patch->remove_this($s, $p, undef, $g); # a wildcard $patch->apply($model); # an RDF::Trine::Model instance
This module is designed to represent a diff for RDF graphs. You add statements to its add or remove sides, then you "apply" them to a RDF::Trine::Model object. This should probably be part of RDF::Trine if there isn't something like this in there already.
Stub constructor, nothing of interest.
Add a statement, or set of terms, to the add side of the patch.
This method and its siblings are fairly robust, and can take a wide variety of inputs, from triple and quad statements, to individual subject/predicate/object/graph objects, to string literals, to variable nodes, to undef. They are processed by the following scheme:
graphattribute of a quad statement supersedes any given graph parameter.
undef, and RDF::Trine::Node::Variable objects are considered to be wildcards, which are only legal in the negative side of the patch, since they don't make sense on the positive side. Placing wildcards in all three of the subject, predicate and object positions will raise an exception, because if carried out it would completely empty the graph. If you're sure you want to do that, you should use another mechanism.
ARRAYreferences into RDF::Trine::Node::Literal instances, the latter case mimicking that class's constructor. URIs or blank nodes must already be at least instances of URI or URI::BNode, if not RDF::Trine::Node::Resource or RDF::Trine::Node::Blank. Note: the empty string is considered a wildcard, so if you want an actual empty string, you will need to pass in an RDF::Trine::Node::Literal with that value.
Remove a statement, or set of terms, from the add side of the patch.
Add a statement, or set of terms, to the remove side of the patch.
Remove a statement, or set of terms, from the remove side of the patch.
Copyright 2013 Dorian Taylor.
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