/**
     * Mark a profile as optional and activated.
     * @param id The identifier of the profile.
     */
    public void activateOptionalProfile(String id) {
        this.activations.put(id, ActivationSettings.activatedOpt());
    }

    /**
     * Mark a profile as required and deactivated.
     * @param id The identifier of the profile.
     */
    public void deactivateRequiredProfile(String id) {

     * @param selector The selector of the project.
     */
    public void activateOptionalProject(String selector) {
        this.activations.add(new ProjectActivationSettings(selector, ActivationSettings.activatedOpt()));
    }

    /**
     * Mark a project as optional and activated.
     * @param selector The selector of the project.
     */
    public void activateOptionalProjectNonRecursive(String selector) {