Dealing with a nested positional record - help

I have a flat file with the following format:
000ABCD123456
100XYZ6789
200TTTzzzz
200TTTzzzz
100XYZ6789
200TTTzzzz
200TTTzzzz
999XYZ

All of the fields on each line are positional and fixed width.  The
records 
have a parent child relation****p.  The 200 records are children of 100.  a

100 record can have many 200 records and there can be many 100 records in
a 
file.  The 000 is a header and the 999 is a trailer.

I'm using BizTalk's flatfile wizard and it generates a schema that will 
validate but it doesn't preserve the relation****ps.  I've tried moving the

element around but that doesnt seem to work.  Is there some other
technique I 
should use?

TIA

-- 
Jake Watkins
JakeW guerillaprogrammer com
EAI Architect - MCSD - C#, Web-Services, WSE, BizTalk 2004, SharePoint
2003, 
InfoPath