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* `swap_values(+Index1:variable_index, +Index2:variable_index)` - swap values of two variables
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* `flip_variable(+Index:variable_index, +HeadsValue:integer, +TailsValue:integer)` - if variable has value `HeadsValue` or `TailsValue`, sets the value to the other one. Otherwise fails.
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## Extensions
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There are several extensions to the NDL query, that can be used in order to increase the language expressiveness.
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### Stochastic mode
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NDL Queries can be compiled as stochastic operator. The stochastic mode impacts ordering of the `variable/(2..6)`, `constraint/3`, `range_element/2` results, effectively returning them in a random fashion. It does **not** impact `for_each` generator.
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**Warning:** stochastic ndl query always backtracks. |
