Hello,

I agree with Dave that there are no rules on that, but I'd like to fully 
understand what you are suggesting for polygons. Do you mean "are different  
_parts_ of a multi-part polygon allowed to overlap" or do you mean "are 
different _edges_ of an individual polygon part allowed to intersect"? The 
latter case could look like this polygon part with 5 nodes: 
![star_polygon2](https://urldefense.us/v3/__https://user-images.githubusercontent.com/8126576/153163392-f77c5224-c87b-456c-9553-c3c1974d4025.png__;!!G2kpM7uM-TzIFchu!jbQAMADur0S6xcPG1SJ9QlcK1lll2cbwrWsNDlSAG8gq1q-ivcLSpBXvv7t4-b0s2E1JyH7nQ2E$
 )
Thanks, David


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