Table of contents

Appendices

2.2 Message Exchange Patterns

WSDL patterns are described in terms of the WSDL component model, specifically the Message Label and Fault Reference components.

In-Only[top]

This pattern consists of exactly one message as follows:

1. A message:

   • indicated by a Message Label component whose {message label} is 'In' and {direction} is 'in'

   • received from some node N

This pattern uses the rule [No Faults].

An operation using this message exchange pattern has a {pattern} property with the value 'http://www.w3.org/2004/08/wsdl/in-only'.

Robust In-Only[top]

This pattern consists of exactly one message as follows:

1. A message:

   • indicated by a Message Label component whose {message label} is 'In' and {direction} is 'in'

   • received from some node N

This pattern uses the rule [Message Triggers Fault].

An operation using this message exchange pattern has a {pattern} property with the value 'http://www.w3.org/2004/08/wsdl/robust-in-only'.

In-Out[top]

This pattern consists of exactly two messages, in order, as follows:

1. A message:

   • indicated by a Message Label component whose {message label} is 'In' and {direction} is 'in'

   • received from some node N

2. A message:

   • indicated by a Message Label component whose {message label} is 'Out' and {direction} is 'out'

   • sent to node N

This pattern uses the rule [Fault Replaces Message].

An operation using this message exchange pattern has a {pattern} property with the value 'http://www.w3.org/2004/08/wsdl/in-out'.

In-Optional-Out[top]

This pattern consists of one or two messages, in order, as follows:

1. A message:

   • indicated by a Message Label component whose {message label} is 'In' and {direction} is 'in'

   • received from some node N

2. An optional message:

   • indicated by a Message Label component whose {message label} is 'Out' and {direction} is 'out'

   • sent to node N

This pattern uses the rule [Message Triggers Fault].

An operation using this message exchange pattern has a {pattern} property with the value 'http://www.w3.org/2004/08/wsdl/in-opt-out'.

Out-Only[top]

This pattern consists of exactly one message as follows:

1. A message:

   • indicated by a Message Label component whose {message label} is 'Out' and {direction} is 'out'

   • sent to some node N

This pattern uses the rule [No Faults].

An operation using this message exchange pattern has a {pattern} property with the value 'http://www.w3.org/2004/08/wsdl/out-only'.

Robust Out-Only[top]

This pattern consists of exactly one message as follows:

1. message:

   • indicated by a Message Label component whose {message label} is 'Out' and {direction} is 'out'

   • sent to some node N

This pattern uses the rule [Message Triggers Fault].

An operation using this message exchange pattern has a {pattern} property with the value 'http://www.w3.org/2004/08/wsdl/robust-out-only'.

Out-In[top]

This pattern consists of exactly two messages, in order, as follows:

1. A message:

   • indicated by a Message Label component whose {message label} is 'Out' and {direction} is 'out'

   • sent to some node N

2. A message:

   • indicated by a Message Label component whose {message label} is 'In' and {direction} is 'in'

   • sent from node N

This pattern uses the rule [Fault Replaces Message].

An operation using this message exchange pattern has a {pattern} property with the value 'http://www.w3.org/2004/08/wsdl/out-in'.

Out-Optional-In[top]

This pattern consists of one or two messages, in order, as follows:

1. A message:

   • indicated by a Message Label component whose {message label} is 'Out' and {direction} is 'out'

   • sent to some node N

2. An optional message:

   • indicated by a MessageLabel component whose {message label} is 'In' and {direction} is 'in'

   • sent from node N

This pattern uses the rule [Message Triggers Fault].

An operation using this message exchange pattern has a {pattern} property with the value 'http://www.w3.org/2004/08/wsdl/out-opt-in'.