XForms WD 20020821 - 2.2 Coding Error?

In the third piece of example code in 2.2 the final expression reads, 
"/my:payment/my:expires".

It seems to me that the expression should read, "/my:payment/my:expiry" to 
correspond to the preceding parts of the example.

This assumes a proper namespace declaration in scope which is not clear from 
the way the example is written.

The example code doesn't unambiguously indicate that the my namespace prefix 
is in scope for the abominable <select1> element and the <input> elements 
since no proper nesting is shown following the seeming namespace declaration.

Andrew Watt