Import errors: Attr should have @lang directive in schema to mutate edge

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Dgraph has its own schema where you can specify the types and indices for each predicate in Dgraph.

The schema can be set up-front as a file you pass to the live loader. e.g., the schema file can look like this (say, in a file named schema.txt):

<predicate1>: string @lang .
<predicate2>: string @lang .
<predicate3>: string @lang .

Then you can pass this to live loader with the -s flag:

dgraph live -r data.rdf.gz -s schema.txt

More about the format of making schema changes is in the docs: https://docs.dgraph.io/query-language/#adding-or-modifying-schema

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