Bug 207120 Please model provide an API for data type conversion.
Currently, there're two data types: column data type and parameter data type. But they're inconsistent. Could model provide APIs for conversion between the two types. Thanks. In addition: please check the code into head and 2.2.1 branch, because we have a 2.2.1 bug to fix.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleUtil.java
{
			public AbstractParseState startElement( String tagName )
			{
				if ( DesignSchemaConstants.REPORT_TAG
						.equalsIgnoreCase( tagName )
						|| DesignSchemaConstants.LIBRARY_TAG
								.equalsIgnoreCase( tagName ) )
					return new VersionState( );
				return super.startElement( tagName );
			}
		}
		/**
		 * Recognizes the top-level tags: Report or Library
		 */
		class VersionState extends InnerParseState
		{
			public void parseAttrs( Attributes attrs )