Special char in the ESP form was not handled properly

Step to reproduce the error:

1. Go to the Form page for EchoTest
2. Type in <abc> in ValueIn textbox
3. Click Submit
4. Error is returned

This page contains the following errors:
error on line 1 at column 45: Opening and ending tag mismatch: abc line 0 and ValueOut
If you check the frame source, the response is:
  <EchoTestResponse><ValueOut><abc></ValueOut></EchoTestResponse>

this is clearly wrong, the <abc> should be: <abc>