This text file contains sample code fragments from:
Section 16.3 - Ignorable Assertions
Chapter 16 - Advanced WS-Policy Part I: Policy Centralization and Nested, Parameterized, and Ignorable Assertions
Book - Web Service Contract Design & Versioning for SOA
Series - Prentice Hall Service-Oriented Computing Series from Thomas Erl
Site - www.soabooks.com


<wsp:Policy>
  <custom:TraceMessage wsp:Ignorable="true"/>
</wsp:Policy>

Example 16.17 - A policy expression containing an ignorable policy assertion.


<wsp:Policy>
  <wsam:Addressing wsp:Optional="true"/>
</wsp:Policy>

Example 16.18 - A policy assertion with the wsp:Optional attribute.


<wsp:Policy>
  <custom:TraceMessage
    wsp:Ignorable="true"
    wsp:Optional="true"/>
</wsp:Policy>

Example 16.19 - A policy assertion with both wsp:Ignorable and wsp:Optional attributes.


<wsp:Policy>
  <wsp:exactlyOne>
    <wsp:All>
      <custom:TraceMessage wsp:Ignorable="true"/>
    </wsp:All>
    <wsp:All/>
  </wsp:exactlyOne>
</wsp:Policy>

Example 16.20 - The policy expression from Example 16.19 is restructured into a policy alternative.


<wsp:Policy>
  <custom:Available wsp:Ignorable="true">
    <start>5:00</start>
    <end>23:00</end>
  </custom:Available>
</wsp:Policy>

Example 16.21 - A parameterized instance of an ignorable policy assertion that states that the Web service is available between 5 AM and 11 PM.


<wsp:Policy Name="http://actioncon.com/policies/finance"
  ...>
  <wsp:All>
    <custom:LogMessage wsp:Ignorable="true"/>
    <wsp:ExactlyOne>
      <sp:TransportBinding>
        ...
      </sp:TransportBinding>
      <sp:SymmetricBinding>
        ...
      </sp:SymmetricBinding>
    </sp:ExactlyOne>
  </wsp:All>
</wsp:Policy>

Example 16.22 - The ignorable custom:LogMessage assertion is added to the finance domain policy definition from the previous case study example.


<wsp:Policy>
  <custom:MyDatabaseIsDB2 wsp:Ignorable="true"/>
</wsp:Policy>

Example 16.23 - An ignorable policy assertion of questionable value.


<wsp:Policy>
  <custom:Database wsp:Ignorable="true">
    DB2
  </custom:Database>
</wsp:Policy>

Example 16.24 - A parameterized version of the preceding policy assertion.