Added reference to PyBackTrip (#180)

# Description:
Added a table with available backends to README file, including the
backends in PyBackTrip.

Closes #177
Closes #157 

## Type of change:
- [ ] Bug fix and code cleanup.
- [ ] New feature.
- [x] Documentation update.
- [ ] Testing.

README.md

@@ -46,6 +46,21 @@ Documentation
 * [Reference manual]
 
 
+Available backends
+------------------
+The following backends are currently available, either in Tripper or other packages.
+
+| Backend name  | Provided by  | Requirements            | Comment
+| ------------  | ------------ | ----------------------- | -----------------
+| rdflib        | [tripper]    | rdflib                  | In-memory [rdflib] triplestore supporting all features.
+| ontopy        | [tripper]    | EMMOntoPy               | Backend for [EMMOntoPy]. In-memory.
+| sparqlwrapper | [tripper]    | sparqlwrapper           | Generic backend for all triplestores supported by [sparqlwrapper].
+| collection    | [tripper]    | DLite-Python            | Backend to a [DLite] collection.
+| fuseki        | [PyBackTrip] | sparqlwrapper           | Backend to [fuseki].
+| stardog       | [PyBackTrip] | sparqlwrapper,pystardog | Backend to [StarDog].
+| graphdb       | [PyBackTrip] | sparqlwrapper           | Backend to [GraphDB].
+
+
 Installation
 ------------
 Tripper has by itself no dependencies outside the standard library, but the triplestore backends may have specific dependencies.
@@ -57,6 +72,17 @@ The package can be installed from [PyPI] using `pip`:
 pip install tripper
 ```
 
+In addition you would need to install the requirements for one or more of the backends listed in the table above.
+For mappings you would also need to install [Pint].
+For example:
+
+```shell
+pip install rdflib pint
+```
+
+
+
+
 License and copyright
 ---------------------
 All files in this repository are licensed under the [MIT license](LICENSE).
@@ -78,9 +104,18 @@ We gratefully acknowledge the following projects for supporting the development
 
 
 
+[tripper]: https://emmc-asbl.github.io/tripper
 [rdflib]: https://rdflib.readthedocs.io/en/stable/
 [PyPI]: https://pypi.org/project/tripper
+[PyBackTrip]: https://github.com/EMMC-ASBL/PyBackTrip/
 [Reference manual]: https://emmc-asbl.github.io/tripper/latest/api_reference/triplestore/
 [Literal]: https://emmc-asbl.github.io/tripper/latest/api_reference/triplestore/#tripper.triplestore.Literal
 [Namespace]: https://emmc-asbl.github.io/tripper/latest/api_reference/triplestore/#tripper.triplestore.Namespace
 [Triplestore]: https://emmc-asbl.github.io/tripper/latest/api_reference/triplestore/#tripper.triplestore.Triplestore
+[EMMOntoPy]: https://emmo-repo.github.io/EMMOntoPy/stable/
+[sparqlwrapper]: https://sparqlwrapper.readthedocs.io/en/latest/
+[DLite]: https://sintef.github.io/dlite/
+[fuseki]: https://jena.apache.org/documentation/fuseki2/
+[StarDog]: https://www.stardog.com/
+[GraphDB]: https://www.ontotext.com/products/graphdb/
+[Pint]: https://pint.readthedocs.io/en/stable/

docs/index.md

@@ -46,6 +46,21 @@ Documentation
 * [Reference manual]
 
 
+Available backends
+------------------
+The following backends are currently available, either in Tripper or other packages.
+
+| Backend name  | Provided by  | Requirements            | Comment
+| ------------  | ------------ | ----------------------- | -----------------
+| rdflib        | [tripper]    | rdflib                  | In-memory [rdflib] triplestore supporting all features.
+| ontopy        | [tripper]    | EMMOntoPy               | Backend for [EMMOntoPy]. In-memory.
+| sparqlwrapper | [tripper]    | sparqlwrapper           | Generic backend for all triplestores supported by [sparqlwrapper].
+| collection    | [tripper]    | DLite-Python            | Backend to a [DLite] collection.
+| fuseki        | [PyBackTrip] | sparqlwrapper           | Backend to [fuseki].
+| stardog       | [PyBackTrip] | sparqlwrapper,pystardog | Backend to [StarDog].
+| graphdb       | [PyBackTrip] | sparqlwrapper           | Backend to [GraphDB].
+
+
 Installation
 ------------
 Tripper has by itself no dependencies outside the standard library, but the triplestore backends may have specific dependencies.
@@ -57,6 +72,17 @@ The package can be installed from [PyPI] using `pip`:
 pip install tripper
 ```
 
+In addition you would need to install the requirements for one or more of the backends listed in the table above.
+For mappings you would also need to install [Pint].
+For example:
+
+```shell
+pip install rdflib pint
+```
+
+
+
+
 License and copyright
 ---------------------
 All files in this repository are licensed under the [MIT license](LICENSE.md).
@@ -78,9 +104,18 @@ We gratefully acknowledge the following projects for supporting the development
 
 
 
+[tripper]: https://emmc-asbl.github.io/tripper
 [rdflib]: https://rdflib.readthedocs.io/en/stable/
 [PyPI]: https://pypi.org/project/tripper
+[PyBackTrip]: https://github.com/EMMC-ASBL/PyBackTrip/
 [Reference manual]: https://emmc-asbl.github.io/tripper/latest/api_reference/triplestore/
 [Literal]: https://emmc-asbl.github.io/tripper/latest/api_reference/triplestore/#tripper.triplestore.Literal
 [Namespace]: https://emmc-asbl.github.io/tripper/latest/api_reference/triplestore/#tripper.triplestore.Namespace
 [Triplestore]: https://emmc-asbl.github.io/tripper/latest/api_reference/triplestore/#tripper.triplestore.Triplestore
+[EMMOntoPy]: https://emmo-repo.github.io/EMMOntoPy/stable/
+[sparqlwrapper]: https://sparqlwrapper.readthedocs.io/en/latest/
+[DLite]: https://sintef.github.io/dlite/
+[fuseki]: https://jena.apache.org/documentation/fuseki2/
+[StarDog]: https://www.stardog.com/
+[GraphDB]: https://www.ontotext.com/products/graphdb/
+[Pint]: https://pint.readthedocs.io/en/stable/

tripper/triplestore.py

@@ -3,7 +3,7 @@
 
 See
 https://raw.githubusercontent.com/EMMC-ASBL/tripper/master/README.md
-for an introduction.
+for an introduction and for a table over available backends.
 
 This module has no dependencies outside the standard library, but the
 triplestore backends may have.
@@ -129,6 +129,10 @@ def __init__(
                 including the dots (ex:"mypackage.mybackend").  If `package`
                 is given, `backend` is interpreted relative to `package`
                 (ex: ..mybackend).
+
+                For a list over available backends, see
+                https://github.com/EMMC-ASBL/tripper#available-backends
+
             base_iri: Base IRI used by the add_function() method when adding
                 new triples. May also be used by the backend.
             database: Name of database to connect to (for backends that