A selector can be reused in various places of a model, to restrict the application of a procedure to a certain set of topologies and states. Selectors can be used to refine the initial conditions of a species, for instance to specify the initial distribution of different states and topologies. They can also be used in a reaction to decide if a this reaction happens, or to modulate its velocity, in function of the state or topology of a reactant.
A selector defines the list of components composing the mask, that are species type existing under a given state (that can be an ensemble of elementary states). In addition to the components, the selector lists the possible or mandatory bonds, as well as the components that must not be bound. It is to be noted that a selector must not necessarily be the most parsimonious. One can use the selectors to describe the fine-grained topology of complexes, even if this topology is not used to decide upon particular reactions. @author Nicolas Rodriguez @since 1.0 @version $Rev: 1639 $
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