Bug 124067 When select the XML file, the relative path should be supported.
Description: When select the XML file, the relative path should be supported. Step to reproduce: 1. new a report 2. new a datasource and dataset based on a XML file 3. select the XML file, the file relative path should be used. Actual result: only the absolute path is supported. Expect result: the relative and absolute path are supported.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/adapter/ModelDteApiAdapter.java
return DataType.UNKNOWN_TYPE;
		if ( modelDataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_ANY ) )
			return DataType.ANY_TYPE;
		if ( modelDataType
				.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_INTEGER ) )
			return DataType.INTEGER_TYPE;
		if ( modelDataType
				.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_STRING ) )
			return DataType.STRING_TYPE;
		if ( modelDataType
				.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_DATETIME ) )
			return DataType.DATE_TYPE;
		if ( modelDataType
				.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_DECIMAL ) )
			return DataType.DECIMAL_TYPE;
		if ( modelDataType
				.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_FLOAT ) )
			return DataType.DOUBLE_TYPE;
		
		if ( modelDataType
				.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_STRUCTURE )
				|| modelDataType
						.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_TABLE ) )
		{
			assert false;
		}
		return DataType.UNKNOWN_TYPE;
	}
	
	public static int toDteFilterOperator( String modelOpr )