Styleable encapsulates the API needed by CSS to style an object. That is to say, if an object implements this interface, then it can be styled by CSS.

public interface Styleable {

    /**
     * The type of this {@code Styleable} that is to be used in selector matching.
     * This is analogous to an "element" in HTML.
     * (<a href=" http://www.w3.org/TR/CSS2/selector.html#type-selectors">CSS Type Selector</a>).
     */
    String getType();

    /**
     * The id of this {@code Styleable}. This simple string identifier is useful for
     * finding a specific Node within the scene graph. While the id of a Node
     * should be unique within the scene graph, this uniqueness is not enforced.
     * This is analogous to the "id" attribute on an HTML element
     * (<a href="http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier">CSS ID Specification</a>).
     * <p>
     * For example, if a Node is given the id of "myId", then the lookup method can
     * be used to find this node as follows: <code>scene.lookup("#myId");</code>.
     * </p>
     */
    String getId();

    /**
     * A list of String identifiers which can be used to logically group
     * Nodes, specifically for an external style engine. This variable is
     * analogous to the "class" attribute on an HTML element and, as such,
     * each element of the list is a style class to which this Node belongs.
     *
     * @see <a href="http://www.w3.org/TR/css3-selectors/#class-html">CSS3 class selectors</a>
     */
   List<String> getStyleClassUnmodifiable();

    /**
     * A string representation of the CSS style associated with this
     * specific {@code Node}. This is analogous to the "style" attribute of an
     * HTML element. Note that, like the HTML style attribute, this
     * variable contains style properties and values and not the
     * selector portion of a style rule.
     */
   String getStyle();
    
    /**
     * Return the parent of this Styleable, or null if there is no parent.
     */
    Styleable getStyleableParent();
    
    /**
     * The CssMetaData of this Styleable. This may be returned as
     * an unmodifiable list.
     */
    List<CssMetaData<? extends Styleable, ?>> getCssMetaData();
           
}