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→Nondeterminism
{{Announce|Updated with Version 11}}: Renamed from {{Code|non-deterministic}} to {{Code|nondeterministic}}.
In [https://www.w3.org/TR/xpath-functions-31/#dt-deterministic XQuery], ''deterministic'' functions are “guaranteed to produce ·identical· results from repeated calls within a single ·execution scope· if the explicit and implicit arguments are identical”. In BaseX, many extension functions are nondeterministic or side-effecting. If an expression is internally flagged as nondeterministic, various optimizations that might change their execution order will not be applied.
<syntaxhighlight lang="xquery">
