Using C# Dataset to read xml file

I have an xml file with the below data:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Tables xmlns:xsi="http://ift.tt/ra1lAU">
    <countries>
        <country country_id = "1" name = "Afghanistan"/>
        <country country_id = "2" name = "Albania"/>
        <country country_id = "3" name = "Algeria"/>
    </countries>
</Tables>

When I try to use the below C# code,

DataSet ds_XMLData= new DataSet();
ds_XMLData.ReadXml(XMLFile);

I get two tables: countries with one column countris_id and one row with value "0" country with 3 columns - additional column being countries_id and all rows with value "0"

Can you please help me understand why is a single table countries not present in the dataset with only two columns - country_id and name?

Also, why is the additional column - countries_id added in all the tables.

Note:- I would like to keep on using the attribute based xml file format.