graphannis 2.4.2

This is a new backend implementation of the ANNIS linguistic search and visualization system.
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# graphANNIS [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.2598164.svg)](https://doi.org/10.5281/zenodo.2598164) ![Automated tests](https://github.com/korpling/graphANNIS/workflows/Automated%20tests/badge.svg)

This is a new backend implementation of the ANNIS linguistic search and visualization system (http://corpus-tools.org/annis/).

**Only a sub-set of the ANNIS Query Langugage (AQL) from ANNIS version 3 (based on PostgreSQL) is supported yet.**
More operators can be added in the future, but the ones missing are the ones which have been used less frequent.
There is a tutorial in the Developer Guide on how to embedd graphANNIS in your own application.

The basic design ideas and data models are described in detail in the PhD-thesis ["ANNIS: A graph-based query system for deeply annotated text corpora"](https://doi.org/10.18452/19659). The thesis describes a prototype implementation in C++ and not Rust, but the design ideas are the same.
Noteable differences/enhancements compared to the thesis are:

- Graph storages implement querying inverse edges and finding reachable nodes based on them: this allows to implement inverse operators (e.g. for precedence) and switching operands in situations where it was not possible before.
- The data model has been simplified: the inverse coverage component and inverse edges in the left-/right-most token component have been removed.
- Additional query language features are now supported.

## How to compile

graphANNIS is written in the Rust programming language (https://www.rust-lang.org).
You can install Rust from https://www.rust-lang.org/tools/install.
After you have installed Rust, you can can build the complete project with

```
cargo build --release
```

## Documentation

- [Developer Guide](https://korpling.github.io/graphANNIS/docs/v2/) (including descriptions of the data model and tutorials for the API)
- [API documentation](https://docs.rs/graphannis/)

## 3rd party dependencies

This software depends on several 3rd party libraries. These are documented in the "third-party-licenses.html" file in this folder.

## Language bindings

- Java: https://github.com/korpling/graphANNIS-java
- Python 3: https://github.com/korpling/graphANNIS-python
- Rust (this repository)
- C (this repository)

## Author(s)

- Thomas Krause (thomaskrause@posteo.de)