TODO list for SOAP::WSDL

2.1 release
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* Support namespaces in SOAP message payload [ 1809057 ]

* Support the xsi:type attribute on derived types on the wire [ 1809059 ]

* SOAP1.2 support [ 1803331 ]

2.2 release
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* XML schema support ("minimal conformant") [ 1764845 ]

* Support SOAP attachments

3.0 release
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We're not thinking that far ahead right now.
