module Nokogiri::CSS::XPathVisitor::BuiltinsConfig

Enum to direct XPathVisitor when to use Nokogiri builtin XPath functions.

ALWAYS: Always use Nokogiri builtin functions whenever possible. This is probably only useful for testing.
NEVER: Never use Nokogiri builtin functions, always generate vanilla XPath 1.0 queries. This is the default when calling Nokogiri::CSS.xpath_for directly.
OPTIMAL: Only use Nokogiri builtin functions when they will be faster than vanilla XPath. This is the behavior chosen when searching for CSS selectors on a Nokogiri document, fragment, or node.