46     public function translateRoot(XPathExpr $xpath): XPathExpr  argument
48         return $xpath->addCondition('not(parent::*)');
51     public function translateFirstChild(XPathExpr $xpath): XPathExpr  argument
53         return $xpath
59     public function translateLastChild(XPathExpr $xpath): XPathExpr  argument
61         return $xpath
70     public function translateFirstOfType(XPathExpr $xpath): XPathExpr  argument
72         if ('*' === $xpath->getElement()) {
76         return $xpath
84     public function translateLastOfType(XPathExpr $xpath): XPathExpr  argument
86         if ('*' === $xpath->getElement()) {
90         return $xpath
95     public function translateOnlyChild(XPathExpr $xpath): XPathExpr  argument
97         return $xpath
103     public function translateOnlyOfType(XPathExpr $xpath): XPathExpr  argument
105         $element = $xpath->getElement();
107 …return $xpath->addCondition(sprintf('count(preceding-sibling::%s)=0 and count(following-sibling::%…
110     public function translateEmpty(XPathExpr $xpath): XPathExpr  argument
112         return $xpath->addCondition('not(*) and not(string-length())');