Element that specifically defines the criteria to be applied to packets of a particular class in order to select that traffic from the network stream. You define selectors in the filter clause of the IPQoS configuration file.
A mechanism for designating the following: Part of a data object (an array element or section, a substring, a derived type, or a structure component) The set of values for which a CASE block is executed
The portion of a rule that determines which elements (if any) will be styled by the associated declaration block. Selectors can be very simple or highly complicated; a simple example is h1 or div#help p (this last is an example of a descendant selector). Multiple selectors can be grouped together in the same rule by separating them with commas, as in: h1, h2, h3.