Bug 149617 Support Content-type-based editor lookup
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/ReportPlugin.java
getPreferenceStore( ).setDefault( RESOURCE_PREFERENCE, "" ); 
	}
	/**
	 * Return default resouce preference
	 * 
	 * @return String The String of default resource preference
	 */
	public String getDefaultResourcePreference( )
	{
		return getPreferenceStore( ).getDefaultString( RESOURCE_PREFERENCE );
	}
	/**
	 * Return resource preference
	 * 
	 * @return String The string of resource preference
	 */
	public String getResourcePreference( )
	{