how to download/uplaod a xml file in abap

Dear experts

I want to create to common function to download/upload xml file in ABAP.

It need to support any kinds of xml format,so i need to create xml file dynamically,

in case of the follow xml structure,i have no idear how to code it,

does someone have ideas?

<class>

  <student>

    <name>A</name>

  </student

  <student>

    <name>B</name>

  </student>

  <teacher>T1</teacher>

  </class>