| Blackboard Image |
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Blackboard images are here considered not to be diagrams
diagrams are (expressions in) formal visual languages, whereas blackboard
images are informal and conversational, and may contain
diagrams as embedded parts.
However, whether a formal structure can be discovered for
blackboard type images as a whole is part of ongoing research.
An exploratory attempt at a grammar for a subset of blackboard
text graphics is up and running.