cache_result

Many of the functions can return purely constant results containing constant strings and XPaths. Provided the function has no side effects and always returns the same result, calling cache_result([true]) will ensure the function is called only once to improve performance. Calling cache_result(false) has no effect (is the default behavior) but can be useful to make it clear where caching must be disabled for a function.

Syntax: function cache_result([enable])
Inputs: enable (optional Boolean)
Outputs: [NONE]
Usage: Any function that is documented to return XPath expressions (No effect if used elsewhere).
See also:  

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