Method synopsis is displayed with hash refs as parameters.

The commented class names in the method's parameters denote that objects
of the corresponding class can be passed instead of the marked hash ref.

You may pass any combination of objects, hash and list refs to these
methods, as long as you meet the structure.

List items (i.e. multiple occurrences) are not displayed in the synopsis.
You may generally pass a list ref of hash refs (or objects) instead of a hash
ref - this may result in invalid XML if used improperly, though. Note that
SOAP::WSDL always expects list references at maximum depth position.

XML attributes are not displayed in this synopsis and cannot be set using
hash refs. See the respective class' documentation for additional information.