[Opa] Facebook integration, escaping and namespaces in xhtml

[Dmitry Degtyarev]

Hello,

This is my first post to the list. I find OPA very promising and currently
in the process of building a niche social network with it.

Three questions:

1. What is the most straightforward and recommended way of creating a
Facebook Login button on a page?
I've created a function to do that:

FacebookLogin = {{
  html(id) = <>
    <div id="fb-root"></div>
    <script src="http://connect.facebook.net/en_US/all.js"></script>
    <script>{"FB.init(\{appId:'{id}', cookie:true, status:true,
xfbml:true\});"}
    </script>
    <fb:login-button>Login with Facebook</fb:login-button>
  </>
}}

The next questions came up when I tried to compile this...

2. How do I escape curly braces inside xhtml? \{ didn't work for me, so I
had to use string insertion, which I find ugly

3. How do I use namespaces inside xhtml? The sample above does not compile,
saying
the variable xmlns:fb is unbound.
Hint:
  Perhaps you meant xmlns: or Xmlns ?

Should I use @xml? Simply replacing <> with @xml( doesn't solve the problem

Regards,
Dmitry
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