https://github.com/iand/nquads

NQuad parser in Go
https://github.com/iand/nquads

go golang linked-data parser rdf semantic-web

Last synced: 18 days ago
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NQuad parser in Go

• Host: GitHub
• URL: https://github.com/iand/nquads
• Owner: iand
• License: unlicense
• Created: 2020-09-20T16:37:11.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2024-04-04T12:04:06.000Z (9 months ago)
• Last Synced: 2024-10-07T23:05:26.416Z (3 months ago)
• Topics: go, golang, linked-data, parser, rdf, semantic-web
• Language: Go
• Homepage:
• Size: 65.4 KB
• Stars: 7
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md

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README

        
# nquads 

A basic nquads parser in Go

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[![go.dev reference](https://img.shields.io/badge/go.dev-reference-007d9c?logo=go&logoColor=white)](https://pkg.go.dev/github.com/iand/nquads)

## Overview

[N-Quads](https://www.w3.org/TR/n-quads/) is a serialisation format for [RDF datasets](https://www.w3.org/TR/rdf11-concepts/#section-dataset).

A dataset consists of a default graph with no name and zero or more named graphs where a graph is a composed of a set of triples. The default 

graph may be empty. 

An N-Quads file is a line-oriented format where each triple or quad statement is terminated by a period `.`.

 - IRIs are enclosed by `<` and `>`

 - Literals have a lexical value enclosed by `"` followed by an optional language tag using `@` as a delimiter, or a data type IRI using `^^` as a delimiter

 - Blank nodes have a lexical label prefixed by `_:` and the same label denotes the same blank node throughout the file.

A triple in a named graph may be written as a statement using four terms, the last of which is the name of the graph:

```

    .

```

A triple in the default graph omits the fourth term:

```

   .

```

## Getting Started

Example of parsing an nquads file and printing out every 5000th quad

```Go

	package main

	import (

		"fmt"

		"os"

		"github.com/iand/nquads"

	)	

	func main() {

		nqfile, err := os.Open("myquads.nq")

		if err != nil {

			fmt.Fprintf(os.Stderr, "Error: %s", err.Error())

			os.Exit(1)

		}

		defer nqfile.Close()

		count := 0

		r := nquads.NewReader(nqfile)

		

		for r.Next()

			count++

			if count % 5000 == 0{

				fmt.Printf("%s\n", r.Quad())

			}

			

		}

		if r.Err() != nil {

			fmt.Printf("Unexpected error encountered: %v\n", r.Err())

		}

	}

```

## Author

* [Ian Davis](http://github.com/iand) - 

# License

This is free and unencumbered software released into the public domain. For more

information, see  or the accompanying [`UNLICENSE`](UNLICENSE) file.

## Credits

The design and logic is inspired by Go's standard csv parsing library