Is there an "or" in XPath selectors?

I am having the follow开发者_如何学Pythoning xPath that gets image from <div class="separator">. My question is how can I make the xPath to search in <div class="entry"> also?

$img = $xpath->query('//div[@class="separator"]//img');

Thanks in advance :)

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$img = $xpath->query('//div[@class="separator" or @class="entry"]//img');

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$img = $xpath->query('//div[@class="separator"]//img | //div[@class="entry"]//img');

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$img = $xpath->query('//div[@class="separator" or @class='entry']//img');