<testExists> - Test for the Existence of a Parameter
<testExists> tag is used to check if a named parameter exists.
This tag has the following attributes:
name (str) : The name of the parameter whose current value is to be checked.
value (str) : This is the string that is compared to. This has to be an exact match and IS case sensitive.
To perform a specific command only when the parameter
serviceactive exists, you would use the following:
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