Chapter 2.4 Inconsistencies

There are several inconsistencies in element naming in Chapter 2.4, 
specifically relating to the use of terms such as <pay:cc> versus <cc>. The 
absence of a namespace prefix in the instance data shown in Chapter 2.4 can 
be expected to lead to errors when applying the binding expressions shown in 
the same chapter.

There are typos in the chapter too.

Andrew Watt