Three placeholder names are reserved and filled automatically from the browser session of whoever is looking at the view, with no form field shown: LOCALPUBKEY is the viewer's signing public key, CURRENTUSER their agent IRI, and SITEURL the address of the Nanodash instance. They let a view react to who is viewing it, for example by offering a \"retract\" action only on rows the viewer signed.

Declare them as optional multi-value placeholders, each with its own empty values block in every scope where it is used: ?__LOCALPUBKEY_multi, ?__CURRENTUSER_multi_iri, ?__SITEURL_multi.

A logged-out visitor has none of them, so the variable is simply unbound and every comparison must tolerate that. Wrap each one in coalesce, as in coalesce(str(?pubkey) = str(?__LOCALPUBKEY_multi), false), so the query still returns its rows instead of failing or dropping them.