A question

Hi all,

I am starting a project that basically stores medical reports in a
native xml database. Some fields of the reports are html documents
edited by the dodctors.
The question is : Is there any technology that let separate from an
html document the plain text and layout information?
The idea is enable to store plain text and layout info separately and,
when we need to show the report, automatically mix them to obtain the
original html document.

Any idea on how to acompplish?

Thanks in advance

Xoan