VALUES operation#24
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Values is the set-valued counterpart of Substitute. Where Substitute injects one term for one variable, Values injects a whole result set (rows of bindings) into a query as a trailing SPARQL VALUES block, so one query can be constrained or batched by the results of another (e.g. SELECT -> Values -> DESCRIBE) in a single request instead of iterating with ForEach. - src/web_algebra/operations/sparql/values.py: execute(query, data, vars?) takes the query Literal plus an rdflib Result (carries the ordered .vars the block header needs), renders short form for one column and long form for many, emits UNDEF for unbound cells, and serializes every term via term.n3() for correct escaping. Blank nodes are rejected (illegal in a VALUES block). Auto-registers via the operations package walk. - Placement is the trailing ValuesClause only (joins the outermost group) — the only VALUES position reachable without deconstructing the query into its algebra. Interior/scoped placement is intentionally out of scope. - tests/unit/test_values.py: short/long form, UNDEF, empty result, vars subset/reorder, bnode rejection, literal escaping, type errors. - Document in prompts/system.md, formal-semantics.md, README op index. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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