What is WCF userPrincipalName value attribute format for using a local account?

问题

assuming the local account name is "JohnDoe" & the local machine name is "Development"...

In a clear, unambiguous functional example what should the value for userPrincipalName be?

    <identity>
      <userPrincipalName value="WHAT GOES HERE IF USING A LOCAL ACCOUNT?" />
    </identity>

来源：https://stackoverflow.com/questions/13941645/what-is-wcf-userprincipalname-value-attribute-format-for-using-a-local-account