Changes

The In [http://www.w3.org/TR/xpath-functions-31/#dt-deterministic XQuery Functions and Operators specification] defines , ''deterministic'' functions that are “guaranteed to produce ·identical· results from repeated calls within a single ·execution scope· if the explicit and implicit arguments are identical” as ''deterministic''. In BaseX, many extension functions are non-deterministic or side-effecting. If an expression is internally flagged as non-deterministic, various optimizations that might change their execution order will not be applied.