1. A computer-implemented method to manage value changes of parameters of an application in a data processing system, based on application phases and based further on restrictions specific to parameter types, the computer-implemented method comprising: identifying a plurality of phases of the application in the data processing system, each phase corresponding to a time period during a lifecycle of the application; identifying a plurality of parameters of the application, including a first parameter of a first parameter type and further including a second parameter of a second parameter type different from the first parameter type; defining, in a parameter administration component of the data processing system, a first restriction attribute applicable to all parameters of the first parameter type and that specifies: (i) a first of the plurality of phases during which any parameter value of the first parameter type is permitted to change and (ii) a second of the plurality of phases during which any parameter value of the first parameter type is not permitted to change; defining, in the parameter administration component, a second restriction attribute applicable to all parameters of the second parameter type and that specifies: (i) the second phase as a phase during which any parameter value of the second parameter type is permitted to change and (ii) a third of the plurality of phases during which any parameter value of the second parameter type is not permitted to change; and enforcing the first and second restriction attributes upon all parameters of the first and second parameter types, respectively, by the parameter administration component when executed by one or more computer processors, such that the first parameter of the first parameter type is permitted to be changed during the first phase and precluded from being changed during the second phase, and such that the second parameter of the second parameter type is permitted to be changed during the second phase and precluded from being changed during the third phase.