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I've started work on a blog article with the working title Connections: Petri nets, systems biology, and beyond. My proposal, with some initial feedback from John, is in another forum post. The initial version of the blog article is here. I've looked at How to write a blog entry, and I think there are a few formatting things I will need to fix up.
My plan now is to continue adding text to the various sections in the blog, and to make sure that the sections are all well connected with each other. My goal is a step-by-step progression. Comments are always welcome and can be posted on this forum page.