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/writer/ModuleWriter.java
* 
	 * @param obj
	 *            the container element
	 * @param slot
	 *            the slot to write
	 * @param tag
	 *            the optional list tag that encloses the list of contents
	 */
	protected void writeContents( DesignElement obj, int slot, String tag )
	{
		writeContents( new ContainerContext( obj, slot ), tag );
	}
	/**
	 * Writes the contents of an element property. The contents are enclosed in
	 * an optional list tag.
	 * 
	 * @param obj
	 *            the container element
	 * @param propName
	 *            the element property to write
	 * @param tag
	 *            the optional list tag that encloses the list of contents
	 */
	protected void writeContents( DesignElement obj, String propName )
	{
		writeContents( new ContainerContext( obj, propName ),
				DesignSchemaConstants.PROPERTY_TAG );
	}
	/**
	 * Writes the contents of a slot. The order is not the order in the slot