rdfnodeID

rdfnodeID refers to the RDF/XML feature that uses the rdf:nodeID attribute to label blank nodes within an RDF/XML document. In RDF, blank nodes represent existential resources without a global IRI. The rdf:nodeID attribute provides a way to assign a local, document-internal identifier to such a blank node so that the same node can be referenced from multiple triples inside the same RDF/XML graph.

Usage and behavior:

- The rdf:nodeID value is a string that must be unique within a single RDF/XML document. It is typically constrained to be a valid NCName in the XML specification.

- An element that describes a blank node can carry rdf:nodeID to indicate the particular anonymous resource, and its child elements define the properties of that node.

- Blank nodes identified by rdf:nodeID are internal to the document and do not constitute globally reusable identifiers like IRIs. They do not carry over when the graph is serialized to other formats, and round-tripping through different serializations may yield different node identifiers or none at all.

Limitations and interoperability:

- rdf:nodeID is specific to the RDF/XML syntax. Other RDF serializations, such as Turtle or N-Triples, do not use this construct to name blank nodes.

- Because node IDs are session- or document-scoped, they should not be relied upon for long-term identity outside the RDF/XML document. They are primarily a convenience for expressing multiple triples about the same blank node within one XML document.

- When converting RDF/XML to other formats, blank nodes may be rewritten as new blank node identifiers or represented without explicit labels, depending on the serializer.