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
* scalarParamAlign -- The choice for the scalarParamter alignment. The
	 * first constant is the name of scalarParamAlign choice. The followed
	 * constants are valid choice values of scalarParamAlign.
	 */
	public static final String CHOICE_SCALAR_PARAM_ALIGN = "scalarParamAlign"; 
	public static final String SCALAR_PARAM_ALIGN_AUTO = "auto"; 
	public static final String SCALAR_PARAM_ALIGN_LEFT = "left"; 
	public static final String SCALAR_PARAM_ALIGN_CENTER = "center"; 
	public static final String SCALAR_PARAM_ALIGN_RIGHT = "right"; 
	/*
	 * columnDataType -- The column data type The first constant is the name of
	 * columnDataType choice. The followed constants are valid choice values of
	 * columnDataType.
	 */
	public static final String CHOICE_COLUMN_DATA_TYPE = "columnDataType"; 
	public static final String COLUMN_DATA_TYPE_ANY = "any"; 
	public static final String COLUMN_DATA_TYPE_INTEGER = "integer"; 
	public static final String COLUMN_DATA_TYPE_STRING = "string"; 
	public static final String COLUMN_DATA_TYPE_DATETIME = "date-time"; 
	public static final String COLUMN_DATA_TYPE_DECIMAL = "decimal"; 
	public static final String COLUMN_DATA_TYPE_FLOAT = "float"; 
	public static final String COLUMN_DATA_TYPE_BOOLEAN = "boolean"; 
	public static final String COLUMN_DATA_TYPE_DATE= "date";
	public static final String COLUMN_DATA_TYPE_TIME= "time";
	
	/**
	 * searchType -- The search type for column hint The first constant is the
	 * name of searchType choice. The followed constants are valid choice values
	 * of searchType.
	 */