# Summary
[Introduction](introduction.md)
# User guide
- [Getting started](getting-started.md)
- [Facts](facts.md)
- [The rule language](language.md)
- [Built-in functions](functions.md)
- [Execution model](execution.md)
- [Your own functions and methods](extending.md)
# Reference
- [Migrating from Grule](migrating.md)
- [Performance](performance.md)
- [API documentation](api.md)