Nanopublication query templates extend grlc by supporting placeholders that can have more than one value. Those have the suffix of \"_multi_iri\" (for IRIs) or just \"_multi\" (for literals). Importantly, they only work if there is at least one occurrence of a \"values\" statement like \"values ?_resource_multi_iri {}\", which indicates where the values are filled in. These multi-value placeholders take 1 or more IRIs/literals.

This feature can be combined with optional placeholders, starting with two underscores like \"?__resource_multi_iri\", which can be filled with zero or more IRIs/literals.