1. SOAP - Simple Object Access Protocol
2. SOAP Envelope
3. SOAP Header
4. SOAP Body
5. SOAP Fault
6. SOAP Roles
7. SOAP Message Exchange Patterns

The SOAP Envelope element is the root element in a SOAP message. Inside the SOAP Envelope you find a Header (optional) and a Body element.

Here is a sample SOAP Envelope element (Envelope element marked in bold):

<?xml version="1.0"?>
<env:Envelope  xmlns:env="http://www.w3.org/2002/06/soap-envelope" >

<env:Header>
</env:Header>

<env:Body>
</env:Body>

</env:Envelope>

Notice the env name space declaration inside the Envelope element:

xmlns:env="http://www.w3.org/2002/06/soap-envelope"

This name space declaration must always be present in a SOAP Envelope element. The prefix (env) can change as you see fit.