The listed requirements for application ids mean that no such ids exist:

 *   <listitem>Application identifiers must contain only the ASCII characters "[A-Z][a-z][0-9]_-" and must not begin with a digit.</listitem>
 *   <listitem>Application identifiers must contain at least one '.' (period) character (and thus at least two elements).</listitem>

The first says "no dots", the second says "at least one dot".

Further, the code disagrees with the docs.  For example, the code requires
a letter first, the docs are happy with a hyphen.  Also, the documented
requirement for a dot to be present is not seen in the code.

Finally, I am guessing that a terminal dot ("Foo.") should not be allowed,
but both code and docs allow it.