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 COLUMN_ALIGN_LEFT = "left"; 
	public static final String COLUMN_ALIGN_CENTER = "center"; 
	public static final String COLUMN_ALIGN_RIGHT = "right"; 
	/**
	 * queryFrom -- Where the query is from The first constant is the name of
	 * queryFrom choice. The followed constants are valid choice values of
	 * queryFrom.
	 */
	public static final String CHOICE_QUERY_CHOICE_TYPE = "queryChoiceType"; 
	public static final String QUERY_CHOICE_TYPE_NONE = "none"; 
	public static final String QUERY_CHOICE_TYPE_TEXT = "text"; 
	public static final String QUERY_CHOICE_TYPE_SCRIPT = "script"; 
	/**
	 * numberFormat -- the number format The first constant is the name of
	 * numberFormat choice. The followed constants are valid choice values of
	 * numberFormat.
	 */
	public static final String CHOICE_NUMBER_FORMAT_TYPE = "numberFormat"; 
	public static final String NUMBER_FORMAT_TYPE_UNFORMATTED = "Unformatted"; 	
	public static final String NUMBER_FORMAT_TYPE_GENERAL_NUMBER = "General Number"; 
	public static final String NUMBER_FORMAT_TYPE_CURRENCY = "Currency"; 
	public static final String NUMBER_FORMAT_TYPE_FIXED = "Fixed"; 
	public static final String NUMBER_FORMAT_TYPE_PERCENT = "Percent"; 
	public static final String NUMBER_FORMAT_TYPE_SCIENTIFIC = "Scientific"; 
	public static final String NUMBER_FORMAT_TYPE_STANDARD = "Standard"; 
	public static final String NUMBER_FORMAT_TYPE_CUSTOM = "Custom"; 
	/**
	 * dateTimeFormat -- the date/time format The first constant is the name of
	 * dateTimeFormat choice. The followed constants are valid choice values of
	 * dateTimeFormat.