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https://github.com/rdf-elixir/sparql-ex

An implementation of SPARQL for Elixir
https://github.com/rdf-elixir/sparql-ex

elixir graph linked-data query-language semantic-web sparql

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An implementation of SPARQL for Elixir

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# SPARQL.ex



[![CI](https://github.com/rdf-elixir/sparql-ex/actions/workflows/ci.yml/badge.svg)](https://github.com/rdf-elixir/sparql-ex/actions/workflows/ci.yml)

[![Hex.pm](https://img.shields.io/hexpm/v/sparql.svg?style=flat-square)](https://hex.pm/packages/sparql)



An implementation of the [SPARQL] standards for Elixir.



It allows to execute SPARQL queries against [RDF.ex] data structures. With the separate [SPARQL.Client] package SPARQL queries can be executed against SPARQL protocol endpoints.



The API documentation can be found [here](https://hexdocs.pm/sparql/). For a guide and more information about SPARQL.ex and it's related projects, go to .



## Current state



Note: **The [SPARQL.Client] supports the full SPARQL 1.1 query language**. The missing query language features in the following list are just not yet supported **by the query engine** executing queries against RDF.ex data structures.



- [ ] SPARQL 1.1 Query Language

    - [x] Basic Graph Pattern matching

    - [x] Group Graph Pattern matching

    - [x] Optional Graph Pattern matching via `OPTIONAL`

    - [x] Alternative Graph Pattern matching via `UNION`

    - [ ] Pattern matching on Named Graphs via `FROM` and `GRAPH`

    - [ ] Solution sequence modification

        - [x] Projection with the `SELECT` clause

        - [x] Assignments to variables in the `SELECT` clause

        - [x] `DISTINCT`

        - [x] `REDUCED`

        - [ ] `ORDER BY`

        - [ ] `OFFSET`

        - [ ] `LIMIT`

    - [x] Restriction of solutions via `FILTER`

    - [x] All builtin functions specified in SPARQL 1.0 and 1.1

    - [x] Ability to define extension functions

    - [x] All XPath constructor functions as specified in the SPARQL 1.1 spec

    - [x] Assignments via `BIND`

    - [x] Negation via `MINUS`

    - [ ] Negation via `NOT EXIST`

    - [ ] Inline Data via `VALUES`

    - [ ] Aggregates via `GROUP BY` and `HAVING`

    - [ ] Subqueries

    - [ ] Property Paths

    - [ ] `ASK` query form

    - [ ] `DESCRIBE` query form

    - [x] `CONSTRUCT` query form

- [ ] SPARQL 1.1 Update

- [x] SPARQL Query Results XML Format

- [x] SPARQL 1.1 Query Results JSON Format

- [x] SPARQL 1.1 Query Results CSV and TSV Formats

- [x] SPARQL 1.1 Protocol (currently client-only; in a separate package: [sparql_client](https://github.com/rdf-elixir/sparql_client))

- [ ] SPARQL 1.1 Graph Store HTTP Protocol

- [ ] SPARQL 1.1 Service Description

- [ ] SPARQL 1.1 Federated Query

- [ ] SPARQL 1.1 Entailment Regimes



Other features on the roadmap:



- [ ] parallelization of the query execution

- [ ] query DSL



## Contributing



see [CONTRIBUTING](CONTRIBUTING.md) for details.



## Consulting



If you need help with your Elixir and Linked Data projects, just contact [NinjaConcept](https://www.ninjaconcept.com/) via .



## License and Copyright



(c) 2017-present Marcel Otto. MIT Licensed, see [LICENSE](LICENSE.md) for details.



[SPARQL]:               http://www.w3.org/TR/sparql11-overview/

[SPARQL.ex]:            https://hex.pm/packages/sparql

[SPARQL.Client]:        https://hex.pm/packages/sparql_client

[RDF.ex]:               https://hex.pm/packages/rdf