Marking Operations as Safe

• "Safe": requester agent incurs no new obligation by invoking the operation
  • Analogous to HTTP GET
  • Can be implemented by with SOAP 1.2's SOAP-Response MEP or HTTP GET
• Permits:
  • Pre-fetch
  • Re-fetch
  • Safe exploration

. . .
<operation name="location" safe="true"
           pattern="http://www.w3.org/2004/08/wsdl/in-out">
  <input element="s:location"
    style="http://www.w3.org/2004/08/wsdl/style/uri-style"/>
  <output element="s:temperature"/>
</operation>
. . .