[Zope] special characters in XML

Hello, I am using a page template to geneate a valid XML document, this is the template: <?xml version="1.0" encoding="UTF-8"?> <person xmlns:tal="http://xml.zope.org/namespaces/tal"> <name tal:content="string:&hello"> Mi mobile </name> </person> The caracter "&" gives me the following error: Compilation failed xml.parsers.expat.ExpatError: not well-formed (invalid token): line 3, column 38 If I remove the "&" everything goes ok. What can I do?? Thank you