Reads each tag within the tags, and the first one that returns content other than an empty string gets returned as output.

FBML-Specific Attributes

Example FBML

Here is example FBML code for <fb:switch/>:

<fb:switch> <fb:name uid="3"/> <!-- if name is blank, move 
    on --> <fb:is-it-christmas> It's Christmas! </fb:is-it-christmas>
    <!-- if it's not christmas, move on --> <fb:default> If all the 
    above tags return nothing, display this text </fb:default>
</fb:switch>

Rendered HTML for Single Instance of Tag

If <fb:name/> returns a name, the rendered HTML looks like this:

Rendered name for user with id '3' ('Jesse Stay')

If <fb:name/> returns nothing, but it’s Christmas day, the rendered HTML looks like this:

It's Christmas!

If both <fb:name/> and <fb:is-it-christmas/> return nothing, the rendered HTML looks like this:

If all the above tags return nothing, display this text