For convenience I'm trying to add an extra property to
Unprotect[CountryData]; CountryData[c_String, "MyProperty"] := 0; (* actually call to another function *) Protect[CountryData];
But when using it I get:
CountryData::notprop: "!(\"\\"MyProperty\\"\") is not a known property for CountryData. Use CountryData[\"Properties\"] for a list of properties."
What's the right way to do this?
There is high probability this is a duplicate, but I wasn't able to find how to do this, sorry in advance