question: public void addActiveHandler ( ContentHandler handler , ModeUsage attributeModeUsage ) { activeHandlers . addElement ( handler ) ; activeHandlersAttributeModeUsage . addElement ( attributeModeUsage ) ; attributeProcessing = Math . max ( attributeProcessing , attributeModeUsage . getAttributeProcessing ( ) ) ; if ( attributeModeUsage . isContextDependent ( ) ) contextDependent = true ; }
target:  Adds a handler for a mode usage.