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https://solid.github.io/ldflex-playground/#['https%3A%2F%2Fruben.verborgh.org%2Fprofile%2F%23me'].friends.lastName
可以试着把 lastName 改成 firstName
LDFlex 通过 ES6 Proxy 把链式调用转换为 SPARQL。 最底下有编译出来的 SPARQL,可以看看自己哪里写错了 debug。