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
writer.attribute( DesignSchemaConstants.NAME_ATTRIB, memberName );
		Iterator iter = list.iterator( );
		while ( iter.hasNext( ) )
		{
			IStructure struct = (IStructure) iter.next( );
			writer.startElement( DesignSchemaConstants.STRUCTURE_TAG );
			Iterator memberIter = prop.getStructDefn( ).propertiesIterator( );
			while ( memberIter.hasNext( ) )
			{
				PropertyDefn memberDefn = (PropertyDefn) memberIter.next( );
				
				
				
				writeMember( struct, memberDefn );
			}
			writer.endElement( );
		}
		writer.endElement( );
	}
	/**
	 * Writes user property definitions.
	 * 
	 * @param obj
	 *            the element that contains user properties
	 */
	protected void writeUserPropertyDefns( DesignElement obj )
	{
		List props = obj.getLocalUserProperties( );
		if ( props == null || props.size( ) == 0 )
			return;