}
String xChannelSelectorStr
= filterElement.getAttributeNS(null, ATTR_X_CHANNEL_SELECTOR);
ARGBChannel xChannelSelector =
computeChannelSelector(xChannelSelectorStr);
String yChannelSelectorStr
= filterElement.getAttributeNS(null, ATTR_Y_CHANNEL_SELECTOR);
ARGBChannel yChannelSelector
= computeChannelSelector(yChannelSelectorStr);
//
// Build filter
//