Quote: an external data format should be self-describing and preserved under round-tripping; e.g., Lisp S-expressions

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All we require [for an external format for presenting data] are two properties: @ … Round-tripping If one converts from an internal representation … S-expressions, for example, possess these properties. XML has … [XML needs the schema to distinguish integers from strings and round-tripping does not work for union types of integers and strings].   Google-1   Google-2

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