Check if element exists in XML using c#

Why do I get false value for hasIdentifier variable, when I see in i-th document anything_start_i.xml that there is <identifier>value</identifier> element.

XDocument doc = XDocument.Load(args[0] + "/?verb=GetRecord&metadataPrefix=p3dm&identifier=" + i);
doc.Save("anything_start" + i + ".xml");
bool hasIdentifier = doc.Elements("identifier").Any();
Console.WriteLine(hasIdentifier);

Tried with Descendants instead of Elements, and again false.