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_UNDERLINE_UNDERLINE = "underline"; 
	
	public static final String CHOICE_TEXT_OVERLINE = "textOverline"; 
	public static final String TEXT_OVERLINE_NONE = "none"; 
	public static final String TEXT_OVERLINE_OVERLINE = "overline"; 
	
	public static final String CHOICE_TEXT_LINE_THROUGH = "textLineThrough"; 
	public static final String TEXT_LINE_THROUGH_NONE = "none"; 
	public static final String TEXT_LINE_THROUGH_LINE_THROUGH = "line-through"; 
	
	public static final String CHOICE_LINE_WIDTH = "lineWidth"; 
	public static final String LINE_WIDTH_THIN = "thin"; 
	public static final String LINE_WIDTH_MEDIUM = "medium"; 
	public static final String LINE_WIDTH_THICK = "thick"; 
	
	public static final String CHOICE_LINE_STYLE = "lineStyle"; 
	public static final String LINE_STYLE_NONE = "none"; 
	public static final String LINE_STYLE_SOLID = "solid"; 
	public static final String LINE_STYLE_DOTTED = "dotted"; 
	public static final String LINE_STYLE_DASHED = "dashed"; 
	public static final String LINE_STYLE_DOUBLE = "double"; 
	public static final String LINE_STYLE_GROOVE = "groove"; 
	public static final String LINE_STYLE_RIDGE = "ridge"; 
	public static final String LINE_STYLE_INSET = "inset"; 
	public static final String LINE_STYLE_OUTSET = "outset"; 
	
	public static final String CHOICE_UNITS = "units"; 
	public static final String UNITS_IN = "in"; 
	public static final String UNITS_CM = "cm"; 
	public static final String UNITS_MM = "mm";