Stem Semantic - modelint/flatland-model-diagram-editor GitHub Wiki

A Stem Semantic is a Diagram Type specific, notation independent meaning that is represented by text, graphic or a combination of the two in at least one Diagram Notation.

In the example below we have the target state Stem Semantic which indicates a transition into some state on a state machine diagram. It is associated with a Stem Position named to state. There is another Stem Position named from state which has no Stem Semantic because there is no special notation for that meaning.

The key point here is that a Stem Semantic represents only a meaning for which there exists some kind of notation to display it.

We also see an example of the class face Stem Position which is used twice on a binary association Connector Type. But a different Stem Semantic is applied in each Stem. Also note that there are two Stems in this example, each corresponding to the same Stem Position.

images/connector-subsystem/10_stem_semantic.png

There's a similar situation in this next example of a generalization Connector Type.

The superclass is called out with a Stem Semantic since it has a notation, but there is none for the subclass face Stem Position.

images/connector-subsystem/20_stem_semantic.png

Below are a couple of Unary Connector examples. In each case the a single Stem Position encompassing the entire Connector length.

An initial transition is a Unary Connector since it has only one node face attachment. The Stem Semantic is named initial pseudo state since that is what the Connector describes. The to intial state Stem Position is decorated with an icon on both the root and vine ends.

The final pseudo state Stem Semantic is also displayed as a Unary Connector with a from initial state Stem Position. Here only the vine end is decorated with an icon.

images/connector-subsystem/30_stem_semantic.png

Identifiers

1. Name

Attributes

Name

A name that reflects the meaning (semantic) of the Stem termination such as “target state” (goes to this state) or “Mc mult” (many conditional multiplicity) or “final psuedo-state”. Care is taken to describe meaning and not notation.

Type: Stem Semantic Name, based on Name