In the sequence above, the variable var is set to the two-letterstring ls.
在上面的命令序列中,把变量var设置为两字母的字符串ls。
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Before I can get to the mapping part of the solution, you need to understand how a simple three-letterstring like DEN gets converted to a point on a map.
Iso3166-country-code.xsd: the ISO3166CountyCode type both constrains the data to be a two-letterstring and requires it to be one of the actual iso 3166-1 country codes.
iso 3166 - country - code . xsd: iso 3166 CountyCode类型约束数据为两个字母的字符串并且要求其必须为一个实际的iso 3166 - 1国家区号。