Wikipedia's reference style
                    Hi, people, I love Zotero, it's a big time-saver for me, but I love Wikipedia's in-built reference style too, mostly because it's so exhaustive (it lists PMIDs, PMCs, DOIs, URLs, the whole nine-yards) and I'd love it if somebody could either write the CSL file for said style, for me, or show me how to do it in a way I could understand. See I'm totally incompetent when it comes to programming so you'll have to be very patient with me. If you want to see what I mean see this page https://en.wikipedia.org/wiki/User:Fuse809/sandbox8.                
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but walking you through creating a citation style step-by-step will take forever, sorry.
<choose>
<if>
<else-if>
<else>
where the last two are optional. You can have multiple <else-if> but only one <if> and <else> for every <choose>
My guess would be that you'll want to add a choose element and then add if as a subnode to that.
The space after the semicolon is set in "delimiter" in the <name> node. It's like set to ";" now, change it to "; ".
Also, note that the visual editor doesn't do PMCID and PMID. Zotero does pick those up from the Extra field, (check how they're imported from pubmed or pubmed central).