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https://github.com/prozion/rtabtree

R lib to read files in Tabtree format; to generate RDF files from Tabtree
https://github.com/prozion/rtabtree

r rdf turtle

Last synced: about 1 month ago
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R lib to read files in Tabtree format; to generate RDF files from Tabtree

Host: GitHub
URL: https://github.com/prozion/rtabtree
Owner: prozion
License: other
Created: 2023-10-10T18:41:08.000Z (over 1 year ago)
Default Branch: main
Last Pushed: 2023-10-24T20:50:23.000Z (over 1 year ago)
Last Synced: 2024-11-06T03:07:27.393Z (3 months ago)
Topics: r, rdf, turtle
Language: R
Homepage:
Size: 41 KB
Stars: 0
Watchers: 1
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.Rmd
- License: LICENSE

Awesome Lists containing this project

README

---
output: github_document
---

```{r, include = FALSE}
knitr::opts_chunk$set(
collapse = TRUE,
comment = "#>",
fig.path = "man/figures/README-",
out.width = "100%"
)
```

N.B.: This is a "sketch of a sketch" for README, the working lib for Tabtree is currently implemented [in Racket language](https://github.com/prozion/tabtree-racket). Transition to R implementation of this library is under way.

# Tabtree

Tabtree — is a compact format to write RDF triples. It uses some syntactic sugar to make a work of editing ontologies in the code editor as easy as possible.

## Tabs define a level in a hierarchy

(The principle similar to Python)

**Tabtree source**
```tabtree
Africa
Kenya
Elgeyo-Marakwet
Iten
Europe
Germany
Saxony_Land
Dresden
Russia
City_of_Moscow
Belyaevo
Zelenograd
Rostov_region
Taganrog
Bogudonia
```

## Files includes

Big ontologies and knowledge graphs is good to divide into several files, regarding the regions of internal cohesion. And then combine them into one resulting Turtle file, ready for uploading to appropriate semtech application.

Here is an example of pasting `factories.tree` contents into the 'central' file called `main.tree`

**Tabtree source**
```tabtree
; main.tree

[factories.tree]
```

## Reification

For writing statements like:

*'By March, 2020, the factory produced 2.5% fat strawberry-flavoured yogurt'*

**Tabtree source**
```tabtree
Milk_factory product:Yogurt_strawberry^fat:2.5^date:2020-03
```

**Turtle result**
```turtle
Stmt_506_product_Yogurt_strawberry
rdf:type rdf:Statement ;
rdf:subject :Milk_factory ;
rdf:predicate :product ;
rdf:object :Yogurt_strawberry ;
:fat "2.5"^^xsd:decimal ;
:date "2020-03"^^xsd:date .
```

## Expanding

**+** sign propagates the predicate-object pair among all the children of the node, where this form was written:

**Tabtree source**
```tabtree
cities +a:UrbanPlace
Beijing
Shanghaj
Shenzhen
Futian_district
```

**Turtle result**
```turtle
:Beijing rdf:type :UrbanPlace .
:Shanghaj rdf:type :UrbanPlace .
:Shenzhen rdf:type :UrbanPlace .
:Futian_district rdf:type :UrbanPlace .
```

**++** Double-plus sign includes predicate-object to the node of origin:

**Tabtree source**
```tabtree
Moscow ++a:UrbanPlace
Zelenograd
Noviy_Gorod
Microdistrict_14
```

**Turtle result**
```turtle
:Moscow rdf:type :UrbanPlace .
:Zelenograd rdf:type :UrbanPlace .
:Noviy_Gorod rdf:type :UrbanPlace .
:Microdistrict_14 rdf:type :UrbanPlace .
```

* Asterisk sign overwrites predicate-object inherited from above, while plain predicate-object without prefixes just adds up to the inherited one:

**Tabtree source**
```tabtree
Moscow ++a:UrbanPlace
Zelenograd
Stariy_Gorod a:InformallyNamedArea
Matushkino-Savelki *a:AdministrativeUnit
Noviy_Gorod
Microdistrict_14
```

**Turtle result**
```turtle
:Moscow rdf:type :UrbanPlace .
:Zelenograd rdf:type :UrbanPlace .
:Stariy_Gorod rdf:type :UrbanPlace, :InformallyNamedArea .
:Matushkino-Savelki rdf:type :AdministrativeUnit .
:Noviy_Gorod rdf:type :UrbanPlace .
:Microdistrict_14 rdf:type :UrbanPlace .
```

## Tabtree file sections

- namespaces
- classes
- properties
- individuals

## Namespaces

**Tabtree source**

!["**Tabtree source**"](man/figures/p1.png?raw=true "Namespaces example")

**Turtle result**
```
@prefix :factory .
@prefix :geoplace .
@prefix :geo .

factory:Taganrog_icecream_factory geo:location geoplace:Taganrog .

```

## Built-ins

Shorthand, frequently used predicates and classes, like `rdfs:subClassOf` or `rdfs:range`

**Tabtree source**
```
City subclass-of:UrbanPlace
```

**Turtle result**
```
:City rdfs:subClassOf :UrbanPlace .
```

### Table of predicate built-ins

### Table of special classes

These classes are not compiled to something different, and needed to be declared together with other resources, but in addition, transpiler uses their names to define the type of object at compilation.