<check> Response Attribute

["Hollenbeck, Scott" <shollenbeck@verisign.com>]

Another small item that could stand cleaning up...

The <check> command response currently returns an element attribute to note
if an object exists.  The value space of this attribute is really boolean,
but the current schema uses a "+" to note "exists" and a "-" to note
"doesn't exist".  I'd like to propose a simplification for the sake of
consistency with other boolean attributes, changing the type of the
attribute to "boolean", an XML Schema data type.  This would mean that the
acceptable values become "1" and "true" for "exists" , and "0" and "false"
for "doesn't exist".

<Scott/>