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Patched version of pikchr.org.
Adds another class next to the standard box, diamond, circle, etc. called "rpl".
Rpl or replace is meant to be replace by a postscript.
You can download merge.py to merge multiple svg files in a single "bundle" that can be used to replace "rpl"'s.
It will filter out defs so it does not play nice with css classes and gradients for example. There is a pubicons-bundle.svg example you can load to stylize the default diagram.
Source code available a Piclasso Github
