What are inside "Message mappers" in WCS 561?

Snapshot of runtime object contents:

CommandContext
|_ adapter
|_ commandProperties - CommandProperty // Contains all properties
|_ sessionContext - CredentialsSpecifiedProgramAdapterSessionContextImpl
|_ commanProperty - CommandProperty // same as above commandProperties


commandProperties and commandProperty are pointing to same object, which contains:
-commandName
-executionProperties (Contains properties where their attributes are specified as 'FieldInfo=CONTROL'
in template file)
-requestProperties (same as getRequestProperties())


From infocenter, it says:
"Control
The name-value pair will be put into a "messageProperty" which contains control information
for the command, such as USERID or PASSWORD
"
I guess, here should be executionProperties instead of messageProperty

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Quote from infocenter:
FieldInfo
Indicate the TypedProperty into which the name value pair should be placed. Data is the default.
If you want to put the name value pair into more than one TypedProperty, you must specify more
than one of the values listed below, separated by a comma:

Data
The name-value pair will be put into the a commandProperty object which contains arguments
for the command.
Control
The name-value pair will be put into a messageProperty which contains control information
for the command, such as USERID or PASSWORD
Command
The name-value pair is used to determine which command should be called. The generated
name-value pairs are used in the CommandMapping element of the TemplateDocument element.