XML Applications: HTTP Traffic logger

[XML-App <XML-App@TeamOn.com>]

Hey All,

 I am quite new to XML application development. I am interested in 
developing an XML based application set and I require your advise to begin 
design/developing it.
 
 The task is simple. I want to extend a HTTP perl proxy [1] to log the HTTP 
traffic that it sees in XML. The reason I require XML here is very clear, 
later I want to be able to 'replay' the recorded log. I believe that XML 
will help me simplify the replay application.

 I already have accomplished part of the task, the HTTP proxy works and it 
logs the traffic it passes through. However, the XML that it generates 
cannot be validated by an XML validator. 

 In the interest of getting the job done right, I want to learn how I can 
begin generating well-formed XML from HTTP traffic. This would also help in 
later, creating an intuitive interface to the log.
 
 My question is, Is there an existing standardized XML schema for this 
purpose that I could follow? If not, then what resources should I be 
looking at to come up with a good schema to encapsulate:
  1. URL's 
  2. HTML Pages
  3. Other Binary data
  
 This the first time I am developing an XML-based application and therefore 
I am a little lost about how I might adhere to standards.

 Thank you for your time. If this is the incorrect list for such posts, I 
apologize in advance.

Best Regards,
Santosh Dawara
Graduate Student
Rochester Instt. of Tech.