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# RDF

## Various

### Declare a default namespace

it will be working just with a `:`:

``` turtle
PREFIX : <http://abc.rutishauser.info/xyz/>

:Bugs_Bunny :name "Bugs Bunny" .
```

### short form for rdf:type

rdf:type is a property `<http://www.w3.org/1999/02/222-rdf-syntax-ns#type>` and is usually shortened to `a`.

### Literal Datatypes

| Serialization | Datatype |
| ------------- | -------- |
| "Bugs Bunny" | xsd:string |
| "Bugs Bunny"%%^^%%xsd:string | xsd:string |
| "Bugs Bunny"@en | rdf:langstring |
| "1940-07-27"%%^^%%xsd:date | xsd:date |
| "1940-07-27T01:00:00.000Z"%%^^%%xsd:date | xsd:dateTime |
| 101 | xsd:integer |
| 2.0 | xsd:decimal |
| True | xsd:boolean |

## Tools

### Raptor

Raptor is a free software / Open Source C library that provides a set of parsers and serializers that generate Resource Description Framework (RDF) triples by parsing syntaxes or serialize the triples into a syntax. The supported parsing syntaxes are RDF/XML, N-Quads, N-Triples 1.0 and 1.1, TRiG, Turtle 2008 and 2013, RDFa 1.0 and 1.1, RSS tag soup including all versions of RSS, Atom 0.3 and Atom 1.0, GRDDL and microformats for HTML, XHTML and XML. The serializing syntaxes are RDF/XML (regular, abbreviated, XMP), Turtle 2013, N-Quads, N-Triples 1.1, Atom 1.0, RSS 1.0, GraphViz DOT, HTML, JSON and mKR.

https://librdf.org/raptor/