Specifying prefixed namespace for SLO requests?

[Curtis Lacy]

Hi, I'm trying to set up a Shibboleth 3.3 IdP, and having trouble processing the logout requests from a particular SP.  Once decrypted, the logout requests look like this: 

<saml:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress">user at domain.tld</saml:NameID>

That's the entirety of the content, and it is rejected with the following error in my log: 

2017-04-06 12:45:27,885 - ERROR [net.shibboleth.utilities.java.support.xml.BasicParserPool:50] - XML Parsing Error 
org.xml.sax.SAXParseException: The prefix "saml" for element "saml:NameID" is not bound. 

Is there a bean or property that I need to provide which defines this "saml" prefix? 

Thanks,

Curtis


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