# Sources and licensing

MoonCEP's MoonBit implementation and synthetic tests were created for this
project with AI assistance. It is not a line-by-line port and does not include
Apache Flink or SASE source code, diagrams or external data fixtures.

Conceptual references:

- [Apache Flink CEP documentation](https://nightlies.apache.org/flink/flink-docs-release-1.20/docs/libs/cep/): vocabulary for contiguity, repetition and match selection. Flink is Apache-2.0 licensed; MoonCEP defines independent boundary behavior.
- [Wu, Diao and Rizvi, SASE, SIGMOD 2006](https://www.cs.columbia.edu/~ewu/files/papers/sase-sigmod06.pdf): automata-based event recognition, windows and delayed absence confirmation.
- [Agrawal et al., SIGMOD 2008](https://people.cs.umass.edu/~yanlei/publications/sase-sigmod08.pdf): take/ignore/proceed choices and capture evidence for event-stream matching.
- [Foundations of Complex Event Processing](https://arxiv.org/abs/1709.05369): explicit semantics and the importance of stating the supported model before claiming complexity guarantees.

Dependencies: the standard library is supplied by the MoonBit toolchain.
The file CLI uses [moonbitlang/x](https://github.com/moonbitlang/x) 0.4.49 under
Apache-2.0. Dependency source is fetched by Moon, not vendored or relicensed.
The original project code is MIT licensed, as stated in the root LICENSE.

The small C#/PowerShell Windows argument adapter is reused from the author's
local MoonBit tooling and adapted to this project. It changes only extended
drive-path arguments passed to installed official tools. It is auxiliary build
code and excluded from the MoonBit source-size count.

## Ecosystem position

MoonCEP's independent contribution is temporal sequence recognition with named
captures, repetition, exclusion/absence and explicit selection semantics.
[Moon Stream Quality](https://github.com/zmjknn/moon-stream-quality) evaluates
data-quality rules; [TideWeave](https://github.com/LMK-ai-nb/TideWeave) maintains
correctable aggregate windows; [MoonUp](https://github.com/mw1696803-hub/moonup)
implements Rete working-memory rules. Their event and time primitives are adjacent
capabilities; this project does not claim those primitives are new to MoonBit.

Directory and source checks on 2026-10-22 did not identify an equivalent published
sequence detector. This is a dated, scoped investigation, not proof that no hidden
or subsequently released implementation exists. Detailed process reports and
competition materials are maintained outside this repository.