Problem with File Content Conversion

Hi experts,

I know how to do the file content conversion when the input xml is like this:

<documentName>

<NameA>

<field-nameA1>field-value</field-nameA1>

<field-nameA2>field-value</field-nameA2>

<field-nameA3>field-value</field-nameA3>

</NameA>

</documentName>

The problem is I have an input xml like this:

<documentName>

<NameA>

<NameA_1>

<field-nameA1>field-value</field-nameA1>

<field-nameA2>field-value</field-nameA2>

<field-nameA3>field-value</field-nameA3>

</NameA_1>

<NameA_2>

<field-nameA1>field-value</field-nameA1>

<field-nameA2>field-value</field-nameA2>

<field-nameA3>field-value</field-nameA3>

</NameA_2>

</NameA>

</documentName>

How can I implement a nested structure like this?

Regards,

Javier,