Bug 179674 Support time dimension in model
When define time dimension in model, the "itTime" property will be set. However this is not enough. We also need to know to what precision the time value should be evaluated, say, year, month, day, etc. Model needs to be enhanced to support such requirement.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/elements/DesignChoiceConstants.java
public static final String TEXT_ALIGN_CENTER = "center"; 
	public static final String TEXT_ALIGN_RIGHT = "right"; 
	public static final String TEXT_ALIGN_JUSTIFY = "justify"; 
	
	public static final String CHOICE_PAGE_SIZE = "pageSize"; 
	public static final String PAGE_SIZE_CUSTOM = "custom"; 
	public static final String PAGE_SIZE_US_LETTER = "us-letter"; 
	public static final String PAGE_SIZE_US_LEGAL = "us-legal"; 
	public static final String PAGE_SIZE_A4 = "a4"; 
	
	public static final String CHOICE_PAGE_ORIENTATION = "pageOrientation"; 
	public static final String PAGE_ORIENTATION_AUTO = "auto"; 
	public static final String PAGE_ORIENTATION_PORTRAIT = "portrait"; 
	public static final String PAGE_ORIENTATION_LANDSCAPE = "landscape"; 
	
	public static final String CHOICE_INTERVAL = "interval"; 
	public static final String INTERVAL_NONE = "none"; 
	public static final String INTERVAL_PREFIX = "prefix"; 
	public static final String INTERVAL_YEAR = "year"; 
	public static final String INTERVAL_QUARTER = "quarter"; 
	public static final String INTERVAL_MONTH = "month"; 
	public static final String INTERVAL_WEEK = "week"; 
	public static final String INTERVAL_DAY = "day"; 
	public static final String INTERVAL_HOUR = "hour"; 
	public static final String INTERVAL_MINUTE = "minute"; 
	public static final String INTERVAL_SECOND = "second"; 
	public static final String INTERVAL_INTERVAL = "interval"; 
	
	public static final String CHOICE_SORT_DIRECTION = "sortDirection"; 
	public static final String SORT_DIRECTION_ASC = "asc";