Chunks have got properties:

• version
• position (top, left)
• dimension (width, height)
• content
• title?
• tags[]
• id (auto-generated)
• input[]
• output[]

And methods:

• update()

Chunk service commands/events:

• create(top, left)/created
• move(top, left)/moved
• resize(width, height)/resized
• delete()/deleted
• setContent(content)/contentChanged