[XeTeX] Checking if a font exists

[Philip Taylor (Webmaster, Ret'd)]

Heiko Oberdiek wrote:

>>> * It takes lots of time if the font cannot be found.
>>> * kpsathea complains "Invalid fontname `Myriad Pro', contains ' '
>>> * The error code is set because of the error message, if the
>>>    font cannot be found.
>>
>> None the less, it still seems to be the philosophically correctly
>> approach (IMHO, of course).
>
> What kind of philosophy? An error as part of normal behaviour? ;-)

I meant the philosophy of Jonathan's approach (use only [Xe]TeX)
rather than [Xe]TeX's behaviour in the presence of his approach
and in the absence of one of more fonts ...

** Phil.