Data Services - "Element" works but "Attribute" does not

Hi,

I created a Data Service using a CSV file. The following code does not work:

<data name="WeatherService">

<config>

<property name="csv_datasource">/usr/local/mashup/dataservices/weather.csv</property>

<property name="csv_columnseperator">,</property>

<property name="csv_columns">City,Weather</property>

<property name="csv_columnordinal">1,2</property>

<property name="csv_startingrow">1</property>

<property name="csv_maxrowcount">10</property>

<property name="csv_hasheader">true</property>

</config>
<query id="listWeatherQry">
<result element="weatherlist" rowName="weatheritem">
<attribute name="city" column="1" />
<attribute name="weather" column="2" />
</result>
</query>
<operation name="listWeather">
<call-query href="listWeatherQry" />
</operation>

</data>

But the following code works (uses "Element" instead of "Attribute"):

<data name="WeatherService">

<config>

<property name="csv_datasource">/usr/local/mashup/dataservices/weather.csv</property>

<property name="csv_columnseperator">,</property>

<property name="csv_columns">City,Weather</property>

<property name="csv_columnordinal">1,2</property>

<property name="csv_startingrow">1</property>

<property name="csv_maxrowcount">10</property>

<property name="csv_hasheader">true</property>

</config>
<query id="listWeatherQry">
<result element="weatherlist" rowName="weatheritem">
<element name="city" column="1" />
<element name="weather" column="2" />
</result>
</query>
<operation name="listWeather">
<call-query href="listWeatherQry" />
</operation>

</data>

What could be wrong?

Regards,

Ganesh Prasad