new, potentially substantive 2.0 erratum

[Lofton Henderson <lofton@rockynet.com>]

In Ch.4 XCF definition, all element names in 4.3, and their associated 
attributes, are lower case.  This includes 'apsid' attribute that occurs on 
many of the 4.3 elements.

In Ch.5, example 5.1b has camel-case 'apsId'.  This would be incorrect XCF 
according to Ch.4.  It would not be hard to fix that error, since it is an 
example.

However, in 5.7.5 it appears as 'apsId' in a parameter name for a method, 
which is more or less harmless.  But in 5.7.6 the attribute of the object 
is defined as 'apsId' (READONLY).  After much discussion and hashing 
around, we think that this is bad practice, but in the specific 
circumstances of this attribute, the XCF and the DOM, it is not likely to 
cause any implementation problems.

The minimal fix is to fix 5.1b.  Does anyone think that we should also 
change the other occurrences of 'apsId' in Ch.5 -- 5.7.5, 5.7.6 and the 
example of 5.7.10 -- need to be changed?

-Lofton.