HTML-safety best practices

I get the following error:

[INFO] Generating method body for img()
[INFO] [WARN] Template with variable in URL attribute context: The
template code generator cannot guarantee HTML-safety of the template
-- please inspect manually or use SafeUri to specify arguments in a
URL attribute context

Using this code template

interface Template extends SafeHtmlTemplates {
@Template("<img src=\"{0}\"/>")
SafeHtml img(String url);
}

What's the right way to make this HTML safe? The url string is
provided by the application not end users of the application. However
I'd like to not have build warnings of this type.

-Dave

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