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This is the master POM file for Sun's Implementation of the JSF 1.2 Specification.
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package javax.faces.component;

import javax.faces.context.FacesContext;

/**
 * UniqueIdVendor is an
 * interface implemented by UIComponents that also
 * implement {@link NamingContainer} so that they can provide unique ids
 * based on their own clientId.  This will reduce the amount of id
 * generation variance between different renderings of the same view and
 * is helpful for improved state saving.
 *
 * @since 2.0
 */
public interface UniqueIdVendor {


    /**Generate an identifier for a component. The identifier
     * will be prefixed with UNIQUE_ID_PREFIX, and will be unique
     * within this component-container. Optionally, a unique seed value can
     * be supplied by component creators which should be
     * included in the generated unique id.
     *
     * @param context FacesContext
     * @param seed an optional seed value - e.g. based on the position of the component in the VDL-template
     * @return a unique-id in this component-container
     */
    public String createUniqueId(FacesContext context, String seed);

}