public function EmptyCollectionComparisonExpression()
{
$emptyColletionCompExpr = new AST\EmptyCollectionComparisonExpression(
$this->CollectionValuedPathExpression()
);
$this->match(Lexer::T_IS);
if ($this->_lexer->isNextToken(Lexer::T_NOT)) {
$this->match(Lexer::T_NOT);
$emptyColletionCompExpr->not = true;
}
$this->match(Lexer::T_EMPTY);
return $emptyColletionCompExpr;
}