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 CHOICE_DATETIME_FORMAT_TYPE = "dateTimeFormat"; 
	public static final String DATETIEM_FORMAT_TYPE_UNFORMATTED = "Unformatted"; 
	public static final String DATETIEM_FORMAT_TYPE_GENERAL_DATE = "General Date"; 
	public static final String DATETIEM_FORMAT_TYPE_LONG_DATE = "Long Date"; 
	public static final String DATETIEM_FORMAT_TYPE_MUDIUM_DATE = "Medium Date"; 
	public static final String DATETIEM_FORMAT_TYPE_SHORT_DATE = "Short Date"; 
	public static final String DATETIEM_FORMAT_TYPE_LONG_TIME = "Long Time"; 
	public static final String DATETIEM_FORMAT_TYPE_MEDIUM_TIME = "Medium Time"; 
	public static final String DATETIEM_FORMAT_TYPE_SHORT_TIME = "Short Time"; 
	public static final String DATETIEM_FORMAT_TYPE_CUSTOM = "Custom"; 
	/**
	 * stringFormat -- the string format The first constant is the name of
	 * stringFormat choice. The followed constants are valid choice values of
	 * stringFormat.
	 */
	public static final String CHOICE_STRING_FORMAT_TYPE = "stringFormat"; 
	public static final String STRING_FORMAT_TYPE_UNFORMATTED = "Unformatted"; 
	public static final String STRING_FORMAT_TYPE_UPPERCASE = ">"; 
	public static final String STRING_FORMAT_TYPE_LOWERCASE = "<"; 
	public static final String STRING_FORMAT_TYPE_CUSTOM = "Custom"; 
	public static final String STRING_FORMAT_TYPE_ZIP_CODE = "Zip Code"; 	
	public static final String STRING_FORMAT_TYPE_ZIP_CODE_4 = "Zip Code + 4"; 	
	public static final String STRING_FORMAT_TYPE_PHONE_NUMBER = "Phone Number"; 
	public static final String STRING_FORMAT_TYPE_SOCIAL_SECURITY_NUMBER = "Social Security Number"; 
	
	public static final String CHOICE_TARGET_NAMES_TYPE = "targetNames"; 
	public static final String TARGET_NAMES_TYPE_BLANK = "_blank"; 
	public static final String TARGET_NAMES_TYPE_SELF = "_self"; 
	public static final String TARGET_NAMES_TYPE_PARENT = "_parent";