src/main/java/org/jfree/graphics2d/svg/SVGHints.java
public static boolean isBeginGroupKey(RenderingHints.Key key) {
        return SVGHints.KEY_BEGIN_GROUP.equals(key) 
                || beginGroupKeys.contains(key);        
    }
public static boolean isBeginGroupKey(RenderingHints.Key key) {
        return SVGHints.KEY_BEGIN_GROUP.equals(key) 
                || beginGroupKeys.contains(key);        
    }
Returns {@code true} if this key is equivalent to
{@link #KEY_BEGIN_GROUP}, and {@code false} otherwise.  The purpose
of this method is to allow certain keys from external packages (such as
JFreeChart and Orson Charts) to use their own keys to drive the
behaviour of {@code SVGHints.KEY_BEGIN_GROUP}.  This has two benefits:
(1) it avoids the necessity to make JFreeSVG a direct dependency, and
(2) it makes the grouping behaviour generic from the point of view of
the external package, rather than SVG-specific.

@param key  the key ({@code null} not permitted)

@return A boolean.

@since 1.8