Bug 179737 The MeasureHandle should be able to provide data type info
We are now allow user input expression as measure expression. However this brings difficulties in determine the data type of a measure expression evaluation result. We need MeasureHandle to be enhanced to include the data type info. Please note that data type "any" is not accepted.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/writer/ModuleWriter.java
{
		writeProperty( obj, null, propName, true );
	}
	/**
	 * Writes one property entry of an structure as CDATA.
	 * 
	 * @param structure
	 *            the structure
	 * @param memberName
	 *            the member name
	 */
	protected void propertyCDATA( IStructure structure, String memberName )
	{
		writeProperty( structure, null, memberName, true, false );
	}
	/**
	 * Writes one property entry of an structure without member name.
	 * 
	 * @param structure
	 *            the structure
	 * @param memberName
	 *            the member name
	 */
	protected void propertyWithoutName( IStructure structure, String memberName )
	{
		writeProperty( structure, null, memberName, false, true );
	}
	/**
	 * Writes the resource key.
	 *