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This RFC adds a new form of `StringValue`, the multi-line string, similar to that found in Python and Scala. A multi-line string starts and ends with a triple-quote: ``` """This is a triple-quoted string and it can contain multiple lines""" ``` Multi-line strings are useful for typing literal bodies of text where new lines should be interpretted literally. In fact, the only escape sequence used is `\"""` and `\` is otherwise allowed unescaped. This is beneficial when writing documentation within strings which may reference the back-slash often: ``` """ In a multi-line string \n and C:\\ are unescaped. """ ``` The primary value of multi-line strings are to write long-form input directly in query text, in tools like GraphiQL, and as a prerequisite to another pending RFC to allow docstring style documentation in the Schema Definition Language. Ref: graphql/graphql-js#926