Understanding 'N'-prefixed IDs with RDFLib-SQLAlchemy

[karthik-m-jain]

When using RDFLib with the SQLAlchemy backend to store RDF data in a PostgreSQL database, I've noticed that some subject and object fields have IDs starting with "N".

Example Entry:

Subject	Predicate	Object
http://purl.obolibrary.org/obo/BFO_0000062	http://www.w3.org/2002/07/owl#propertyChainAxiom	N160ea22f83814f728990ceaafb6fbc43

Question:

• What is the significance of these IDs starting with "N"?
• Are they representing blank nodes in RDF?
• How should they be interpreted or handled when querying the database directly?
• Any clarification on this would be greatly appreciated.

Thank you!