You want add new-lines and indentation to the "plain text" format right?
From:
<start><name>Tomas</name></start>...
To:
<start>
<name>Tomas</name>
</start>
...
If so, then how exactly you are creating that XML structure and file?
Try look on ABAP iXML interface, which has "pretty printer" function. Here is link on SCN wiki document and example code: