SYSML2_ — Port transfer semantics

In 7.12.1 Ports Overview, at the end of the third paragraph, it states

A transfer can occur from the out features of one port usage to the matching in features of connected port usages. Transfers can occur in both directions between matching inout features.

It is unclear whether this is intended to mean that such transfers happen automatically in some way, or if it just means that it is possible to have such transfers by adding explicit flows to the model. If the former is intended, then this does not seem to be currently supported by port semantics (8.4.8). If the latter is intended, this should be made more clear.