Bug 176436 Charts Imported from Libraries do not update when libraries change
During a live presentation of BIRT at EclipseCon, we came across a rather embarassing issue. When charts are included in a library, and imported into a report design from a library, any changes to the library instance of the chart do not reflect in the report itself.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/elements/ExtendedItem.java
extensionName = extension;
		if ( extensionName != null )
		{
			provider = new PeerExtensibilityProvider( this, extensionName );
			initSlots( );
		}
		else
			provider = null;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.core.DesignElement#getSlot(int)
	 */
	public ContainerSlot getSlot( int slot )
	{
		assert slot >= 0 && slot < getDefn( ).getSlotCount( );
		return slots[slot];
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.core.DesignElement#getDefn()
	 */
	public IElementDefn getDefn( )
	{
		IElementDefn extDefn = getExtDefn( );
		if ( extDefn != null )
			return extDefn;
		return super.getDefn( );