The XPath expression is evaluated in the context of the crawler, which
is considered as a fake parent of the elements inside it.
This means that a child selector "div" or "./div" will match only
the div elements of the current crawler, not their children.
public filterXPath ( string $xpath ) : |
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$xpath | string | An XPath expression |
리턴 | A new instance of Crawler with the filtered list of nodes |