Transform flat xml to structure xml again

Hi,

i have another flat xml file as an input, and needs to transform it into a structure xml.

How do i do that, without messing up the sequence of the content

Thanks

Input:
 
<content>
<para1>This is a libel action</para1>
<para2>When the Exco received the Requisition</para2>
<para1>I held that there was no reason to grant an extension</para1>
<Quote1>This Quite 1 to be in para 1</Quote1>
<QuoteList1>This is quotelist to be in para as well</QuoteList1>
<para2>For the foregoing reasons</para2>
<para3>para 3 content</para3>
<para3>para 3 content</para3>
<para3>para 3 content</para3>
<para2>Para 2 content</para2>
<para1>Para 1 again</para1>
<QuoteList1>This is quotelist to be in para as well</QuoteList1>
<Quote1>This Quite 1 to be in para 1</Quote1>
</content>
 
output:
<content>
<para1>This is a libel action
    <para2>When the Exco received the Requisition</para2>
</para1>
 
<para1>I held that there was no reason to grant an extension
    <Quote1>This Quite 1 to be in para 1</Quote1>
    <QuoteList1>This is quotelist to be in para as well</QuoteList1>
    <para2>For the foregoing reasons
         <para3>para 3 content</para3>
         <para3>para 3 content</para3>
         <para3>para 3 content</para3>
    </para2>
    <para2>Para 2 content</para2>
</para1>
 
<para1>Para 1 again
    <QuoteList1>This is quotelist to be in para as well</QuoteList1>
    <Quote1>This Quite 1 to be in para 1</Quote1>
</para1>
</content>

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