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<br />,', " u u (j 1'77 <br /> <br />Opera lion Policies In RSS <br /> <br />POLICY name TO_DETERMINE variable FOR object <br />BEGIN <br />IF condition_l AND condition_2 OR condition_3 <br />THEN variable = some expression of variables and/or <br />functions of variables <br />END <br /> <br />To clarify what is being compared when using the OR operator, parentheses '0" <br />may be used, For example, consider a situation in which four variables are <br />being checked to see if they have been defined: <br /> <br />IF variable 1 AND variable_2 OR variable 3 AND <br />variable_4 <br /> <br />This condition could be more clearly specified as: <br /> <br />IF ( variable_l AND variable_2 <br />variable_4) <br /> <br />OR ( variable_3 AND <br /> <br />or <br /> <br />IF variable 1 AND ( variable 2 OR variable_3 ) ,AND <br />variable 4 <br /> <br />depending on what the meaning of the expression needs to be, <br /> <br />Comments <br /> <br />Comments within policy statements are allowed and need to be contained <br />within either curly or square brackets: (comment} or [comment]. All comments <br />within curly brackets will be ignored by RSS. All comments within the square <br />brackets (while being outside the curly brackets I) will be written to a file each <br />time the policy statement is called and executed during a simulation, This <br />feature of RSS can provide a record of the sequence of policy statement opera- <br />tions for examination following a simulation, <br /> <br />Policy statement <br />name <br /> <br />The name of the policy statement follows the keyword POLICY in the header of <br />the policy statement. The policy name can be any string of alphanumeric char- <br />acters that will help the writer or user of the model identify or classify the policy <br />statement. Each policy statement requires a name but the name is not used by <br />the RSS program itself, <br /> <br />To-determine <br /> <br />Each statement is written to define how the value of a variable is to be deter- <br />mined. The name of the variable can be the name of an object slot variable, or <br />of any other user defined variable. RSS object variables that the user can <br />change using policy statements are contained in Table 1, No periOdS can be <br />included in the variable name. The name of the variable to be determined will <br />not include the object name, For example, if the outflow (or release) from a <br /> <br />Operation Policies in RSS <br /> <br />21 <br />