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Some additional links from Pete:
https://corporatefinanceinstitute.com/resources/knowledge/trading-investing/depositary-receipt/
https://www.sec.gov/files/adr-bulletin.pdf
https://www.investopedia.com/investing/introduction-depositary-receipts/
We made some significant progress this week, but still have a few gaps based on John's document w.r.t American depositary receipt levels, among other things. Also, given how Luxembourg DRs are defined, perhaps depositary receipt should be a subclass of Security, and then American, European, and Global should also be subclasses of EquityInstrument.
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