The Description text incorrectly references DefaultInputValues. This was a holdover from an earlier version of Method Meta data.

The last paragraph states:
"If a Method has optional input arguments, these optional input arguments are indicated by the Method’s DefaultInputValues Property. In this case fewer arguments than the total number of input arguments defined may be passed by the Client. The InputArguments and DefaultInputValues Property are defined in Part 3."

It should be replaced by the following text:

"Fewer arguments than the total number of input arguments defined may be passed by the Client when optional input arguments are defined. A Method may define input arguments as optional by including HasOptionalInputArgumentDescription references to argument Metadata. The InputArguments Property and the HasOptionalInputArgumentDescription ReferenceType are defined in Part 3."