pub const MAX_PREDICATE_NESTING_DEPTH: u32 = 8;Expand description
Maximum predicate-nesting depth accepted by parse_xpath_with.
XPath eval is O(N^k) in document size N and predicate-nesting depth
k. Realistic queries rarely exceed depth 3 (//section[chapter[ paragraph[contains(., 'x')]]]); legitimate generated XPath
(e.g., SPARQL→XPath translation) sometimes reaches depth 4-5. Eight
is a generous ceiling that lets every legitimate pattern through
while rejecting the obviously-adversarial inputs the fuzzer finds
(//*[//*[//*[//*[//*[//*[//*[.='x']]]]]]] at depth 7 burns the
full 500k step budget in tens of milliseconds — caught here in
microseconds at parse time).