Anonymous resources with [...]

Sometimes a resource exists only as structural glue — an address, a point in space, a one-shot value. Mint a blank node with [...]:

:Alice :hasAddress [ :city "Tokyo" ; :zip "100-0001" ] .

The address has no IRI but still carries triples.

When to use a blank node, and when to avoid one. Reach for [...] when the thing genuinely has no use outside this one statement — an address line, a measurement, an RDF list cell. Avoid blank nodes for anything you might want to reference from another graph, link to from the outside, or look up later: blank-node identifiers are local to the document and can't be addressed across the Web.

A blank node is like saying some house in Tokyo without giving it a street address. You can still describe its roof and windows; you just can't link to it from outside the conversation.

That limitation is also its appeal: when some house is all you mean, minting a proper street address would be misleading — it would imply the thing is identifiable when in fact it's just structural filler.