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
*/
	protected static Base64 base = new Base64( );
	/**
	 * The compatibility to create bound columns.
	 */
	protected BoundColumnsWriterMgr boundColumnsMgr = null;
	/**
	 * Control flag indicating whether need mark line number.
	 */
	protected boolean markLineNumber = true;
	/**
	 * Returns the module to write.
	 * 
	 * @return the module to write
	 */
	abstract protected Module getModule( );
	/**
	 * Writes the report design to a file.
	 * 
	 * @param outputFile
	 *            output file into which to write the design
	 * 
	 * @throws IOException
	 *             if a write error occurs
	 */
	public void write( File outputFile ) throws IOException
	{
		
		ModuleOption options = getModule( ).getOptions( );
		if ( options != null )