Object creation Message has a dashed line with an open arrow
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sdedit does not claim to strictly follow any version of any UML
specification.
It makes - similar to the cited UML specification - a difference between
synchronous (closed arrow) and asynchronous (open arrow) calls. To
sdedit,
an object creation message (normally) is just a synchronous call to a
constructor which has a solid line with a closed arrow. Dashed lines are
used for answers only.
An object creation message may also have a solid line with an open arrow,
if it is a message triggering the creation of a new thread.