bindAttribute ??????

Thanks for the info SafariTECH, but I looked all through that link, and there is still not a single example that uses the bindAttribute value. I've got the bind down, no problem, but I am VERY curious what exactly the bindAttribute does since I can't seem to find ANYONE or ANY example that uses it.

Here's one of their examples:
<cfinput type="text" name="email" label="email" bind="{firstName.text}.{lastName.text}@mm.com">

Now, what would this do:
<cfinput type="text" name="email" label="email" bind="{firstName.text}.{lastName.text}@mm.com" bindAttribute="???????">

I'm just very curious what the bindAttribute attribute is, how you use it, and what it does.

Anyone have a suggestion or example?