How to index rich document with XML payload?

[Steve Johnson]

Greetings,

I am new to Solr, but have gotten as far as successfully indexing 
documents both by sending XML describing the document and by sending the 
document itself using "update/extract".  What I want to do now is, in 
effect, do both of these on each of my documents.  I want to be able to 
have Tika do its magic first, and then I want to add additional fields 
to my document entries using XML.

Is there any way to do this?  In general, is there any way to apply 
multiple update requests to a single document entry?

I do understand that I can put literal values on the "update/extract" 
URL to do what I'm asking.  This is what I'll have to do if I can't 
figure out another way, but it seems messy to me...I'd much rather send 
an XML payload.

TIA for any help.