Array property trasnfer

Hi everyone,
I'm facing the problem of transferring multiple values to input request
What if I would like to make a request with the following input in an automatic way? How could I use an external source to load data?

<books>
<book>
<title>t1</title> --from external XLS
</book>
<book>
<title>t2</title> -- from external XLS
</book>
</books>

Thanks in advance
Fabrizio