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I am reading a document of Varnish and I get the important VCL state image shown below.

We know we often use UML as a standard to draw a state machine.

but this image is not, is it follow another standard? or not?

I can understand the start/end diagram (hexagon), state diagram(two rectangle), judgement condition(rhombus),

but I don't understand what the oval represents, please tell me.

enter image description here

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The ovals are the 'states' in the finite state machine.

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