[
  {
    "path": "README.adoc",
    "content": "= XTDB 'core2' Research 🧪\n\nWelcome to the XTDB research repository!\n\nNOTE: Core2 now lives in the main XTDB repo, under the https://github.com/xtdb/xtdb/tree/2.x[2.x] branch.\n\n---\n\ncore2 is a bitemporal and dynamic relational database for SQL and Datalog:\n\n- Bitemporal means that all data is accurately versioned as updates are made (system time), and all data exists within a universal domain timeline for representing 'validity'/'effectivity' (application time).\n- Dynamic means that no upfront schema needs to be specified before records can be inserted. Complex and nested data is automatically represented using https://arrow.apache.org/[Apache Arrow] types.\n- Relational means that the full spectrum of traditional SQL database capabilities is available - including joins, transactions, https://en.wikipedia.org/wiki/Multiset#Applications[bag/multiset] semantics, https://en.wikipedia.org/wiki/Three-valued_logic[three-valued logic], multiple N-ary relations etc.\n- SQL means immediate accessibility for a mainstream audience, but also includes an eye to the future with preliminary https://arrow.apache.org/blog/2022/02/16/introducing-arrow-flight-sql/[Flight SQL] driver support.\n- https://en.wikipedia.org/wiki/Datalog[Datalog] means a programmer-friendly API for complex relational querying that bypasses SQL's verbose JOINs and https://www.scattered-thoughts.net/writing/against-sql/[compositional challenges].\n"
  }
]