Templates limitation, no recursion
I just realised another limitation of the templates mechanism: You can not invoke a template from the string you send to another template. Specifically, I tried to format an external link in an intro, like this:
That fails, as the interpreter is not recursive on this level, and thus is not able to nest template invocations like this. (That is also expressly stated on the , section FAQ.)
The implication is that intros (and of course any use of a template) can only contain "plain text", or text formatted with other wiki or html functions. Pity.