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<br />Policy conditions <br /> <br />, f") , <br />~.,.,. <br />~ ,\ <br /> <br />'ry'/' Policy priorities <br /> <br />Conflicting policy <br />statements <br /> <br />Policy functions <br /> <br />Opera lion PolicIes In RSS <br /> <br />.. <br /> <br />to insure that the dividend is other than zero before executing that expression, <br />This check could be performed in the condition portion of the policy statement. <br />Also, if dividing by an integer number, it may be prudent to place a decimal point <br />after the number, <br /> <br />;_':.~,?, <br />.i <br /> <br />The usual programming conventions apply in the case of no clear ordering of <br />operations through the use of parentheses (). Thus: <br /> <br />A+B-C*O/E implies (A+B) -((C*OJ/E) <br /> <br />If one or more conditions must be met before the operation defined in a policy <br />statement can be executed. these conditions can be contained between the <br />keywords IF and THEN, An example of a condition is illustrated below, using the <br />letters A, S, C, and D to represent variables, functions or expressions. <br /> <br />IF A <= BAND C AND ( A = 0+3 OR (A> C AND C <> 0)) <br />THEN <br /> <br />This condition specifies that 'A" cannot exceed'S", 'C" must have a value, and <br />"A" must be the same as 'D" +3 or 'A" must be greater than a non-zero "COO, The <br />author of policy statements may use any of the operators specifying relationships <br />among variables or expressions of variables. These operators are listed below, <br /> <br />TABLE 2, Policy statement operators <br /> <br />relationShip <br />the same as <br />not the same as <br />less or equal <br />less than <br />greater or equal, <br />greater than <br /> <br />operators <br /> <br />= <br /> <br /><> <br /> <br /><= <br /> <br />< <br /> <br />>= <br /> <br />> <br /> <br />Any policy written for a parent Object will apply to all the children objects of that <br />parent. If a policy written for a child conflicts with a parent policy, the child policy <br />will apply. The conflicting parent policy will be ignored. <br /> <br />If multiple policy statements apply to a particular data slot, the last statement that <br />is executed will be the one that determines the value of that data slot. <br /> <br />The expressions used in policy statements may include functions. The functions <br />available in the RSS program, together with their arguments and description are <br />contained in Table 3, It identifies the function name, its type, its arguments and <br />argument types, and presents an example of how it might appear in a policy state- <br />ment. <br /> <br />There are three possible argument and function types: an integer (I.e. a number <br />without a decimal or fraction), a real (non-integer) number of double precision, <br /> <br />24 <br /> <br />Operation Policies in RSS <br />