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SOAP Syntax

SOAP Building Blocks

A SOAP message is an ordinary XML document and it contains the following elements:

• A SOAP envelope, that defines the content of the message
• A SOAP header (optional), that contains header information
• A SOAP body, that contains call and response information

Syntax Rules

Here are some syntax rules:

• A SOAP message MUST be encoded using XML
• A SOAP message MUST have a SOAP Envelope
• A SOAP message CAN have a SOAP header
• A SOAP message MUST have a SOAP Body
• A SOAP message MUST use the SOAP Envelope namespace
• A SOAP message MUST use the SOAP Encoding namespace
• A SOAP message must NOT contain a DTD reference
• A SOAP message must NOT contain XML Processing Instructions

SOAP Namespaces

The default namespace for the SOAP envelope:
http://www.w3.org/2001/12/soap-envelope

The default namespace for SOAP encoding and data types:
http://www.w3.org/2001/12/soap-encoding

SOAP Request Example

<soap:Envelope>
  <soap:Body>
    <GetPrice>
      <Item>Apples</Item>
    </GetPrice>
  </soap:Body>
</soap:Envelope>

The example above is a simplified SOAP XML document, requesting the price of apples.

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