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TimSweeneyEpic's profile
Tim Sweeney
Tim Sweeney
Tim Sweeney
@TimSweeneyEpic

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Tim Sweeney

@TimSweeneyEpic

Epic Games founder & CEO

epicgames.com
Joined August 2013

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    Tim Sweeney‏ @TimSweeneyEpic 3 Aug 2019
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    The problem with JSON and XML based file formats is the tendency to require further parsing to decode values from strings. A universal interchange file format would have the ability to express all common data types through the composition of atomic values and containers.

    6:37 PM - 3 Aug 2019
    • 28 Retweets
    • 230 Likes
    • Robert Anderberg Den ☻𝔊𝔯𝔞𝔠𝔢☻ mesidin Scott Meador Carl Chris Hekman Arjen Beij Jacob Garbarz
    35 replies 28 retweets 230 likes
      1. New conversation
      2. Tim Sweeney‏ @TimSweeneyEpic 3 Aug 2019
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        Between all the major programming language families, you won’t find more than a couple dozen atomic types, a dozen distinct (up to isomorphism) container types, and a couple conventions for nominal containers that achieve globally unambiguous name scoping.

        4 replies 3 retweets 37 likes
        Show this thread
      3. Tim Sweeney‏ @TimSweeneyEpic 3 Aug 2019
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        A desirable property here is: A value expressed in a universal interchange format unambiguously expresses its type, with no question of e.g. whether a string should be interpreted as a string, an enum, or a hex encoded byte array.

        9 replies 1 retweet 42 likes
        Show this thread
      4. Tim Sweeney‏ @TimSweeneyEpic 3 Aug 2019
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        Another desirable property is diffability. JSON makes single-line semantic changes require multi-line adjustment of commas, and XML with end tags.

        8 replies 0 retweets 31 likes
        Show this thread
      5. Tim Sweeney‏ @TimSweeneyEpic 3 Aug 2019
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        Finally, real data contains some equivalent of pointers or references, often with cycles. A universal interchange format must be able to express a snapshot of this data at a point in time, including references to external data that may be found elsewhere.

        9 replies 2 retweets 44 likes
        Show this thread
      6. Tim Sweeney‏ @TimSweeneyEpic 3 Aug 2019
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        It’s the lack of this notion of local and remote references in data that leaves Java and C# requiring ad hoc database glue layers in languages that were otherwise sufficiently high-level that they could have solved the problem in a wonderfully general way.

        25 replies 0 retweets 40 likes
        Show this thread
      7. End of conversation
      1. New conversation
      2. Wouter‏ @wvo 4 Aug 2019
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        Replying to @TimSweeneyEpic

        FlatBuffers has "pointers" (it can express a DAG). It is of course a binary format, but I believe text should be a "UI" feature, not the source of truth (FlatBuffers converts to and from JSON out of the box). Strongly typed, mmap-able data that can evolve flexibly.

        2 replies 1 retweet 9 likes
      3. Tim Sweeney‏ @TimSweeneyEpic 4 Aug 2019
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        Replying to @wvo

        Is the world ready to freeze in-memory runtime representations of complex structured data? I’m skeptical of this thesis.

        3 replies 0 retweets 0 likes
      4. 1 more reply
      1. New conversation
      2. David Cravens‏ @astraltheman 3 Aug 2019
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        Replying to @TimSweeneyEpic

        The problem with xml is that it continues to be used. A universal interchange format is a pipe dream (see rel. xkcd)... atomic representation means versioning at least... with json you go in knowing parse is needed. Not great but good enough

        3 replies 0 retweets 4 likes
      3. Tim Sweeney‏ @TimSweeneyEpic 3 Aug 2019
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        Replying to @astraltheman

        Agreed, but I think a self-consistent, precedent-respecting specification based the known best practices would produce something far more friendly for interchange than JSON or XML.

        2 replies 0 retweets 5 likes
      4. 3 more replies
      1. New conversation
      2. Jonathan Cast‏ @jonathanccast 3 Aug 2019
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        Replying to @TimSweeneyEpic

        I don't think a universal interchange format is truly possible. The set of data types you need is *always* further-extensible.

        1 reply 0 retweets 1 like
      3. Tim Sweeney‏ @TimSweeneyEpic 3 Aug 2019
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        Replying to @jonathanccast

        A universal file format could enable these to be expressed as a composition of containers in a global namespace and atomic types for now, and parts of the namespace could be standardized over time, for example commonizing Unreal and Unity 3D vectors.

        1 reply 0 retweets 11 likes
      4. 1 more reply

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