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    • Generates SPARQL USING clauses declaring an update's default-graph dataset.

      Emits one using <graph> clause per graph, serialising each via reference and merging it into the default graph the where pattern of a deleet or insert template matches against; repeat graphs to build a multi-graph default dataset. The clauses sit between the update template and its where clause. Empty graphs, such as those produced by nil, are dropped first; an empty list yields the empty fragment, leaving the dataset to the graph store's default.

      Parameters

      Returns string

      The space-joined SPARQL USING clauses, or the empty fragment for no graphs