Splitting huge XML Files into fixsized wellformed parts

Hi,

I am kind of depressed :-) I want to split xml-files with sizes
greater than 2 gb into smaler chunks. As I dont want to end up with
billions of files, I want those splitted files to have configurable
sizes like 250 MB. Each file should be well formed having an exact
copy of the header (and footer as the closing of the header) from the
original file. Forthermore, a table should be generated were I can
see, that the File X is seperated into Part N with timestamp:

Table:

Orginalfilename|Name of PartN|Size of PartN|Timestamp



The Original XML-Files look like this:
<?xml ...>
<Headerelement with some infos to be copied 1to1>
         <OfferInfo>
                         <OfferID></OfferID>
                          ...
          </OfferInfo>
         <OfferInfo>
                         <OfferID></OfferID>
                          ...
          </OfferInfo>
         <OfferInfo>
                         <OfferID></OfferID>
                          ...
          </OfferInfo>
</Headerelement>



All in all I ended up with reading the XML processing docus with gawk,
but as it seems I am lacking some deeper programming skills.. Could
someone please help?

Thx
Malapha