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Native golang library for RDF (includes parser/serializer for Turtle and JSON-LD)

License: MIT License

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turtle graph serializer triples json-ld rdf

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rdf2go's Issues

rdf2go usage with SMW?

Hello,

I have read this Paper and it mentioned the usage of rdf2go with Semantic Mediawiki (SMW). I came to your repository, hoping for some example or some demo that can show how one can make it work with SMW.

I am looking forward to getting any help from you regarding the rdf2go integration with SMW!

Thanks.

Convert TTL or JSON-LD to GO struct

I'm able to convert TTL file to a JSON-LD format. Note, the conversion is not perfect because it lacks of @Context metadata. I compared the output using this repo vs online converters.
But how can I convert from JSON-LD to an a Golang structs? Or even better, can I convert straight from RDF TTL to Golang struct?

IterTriples causes concurrent map error

I'm a happy user of this library but we get occasional errors from the Go runtime's 'concurrent map misuse detector' which makes the program crash: https://go.dev/doc/go1.6#runtime

I believe IterTriples() needs to be changed to avoid this error, e.g. by adding a lock:

rdf2go/graph.go

Line 107 in c39eb29

func (g *Graph) IterTriples() (ch chan *Triple) {

You may also need to use this same lock inside the reader methods.

Alternatively you could avoid creating a goroutine inside IterTriples().

Working with # IRI

So I am seeing if I can read a VoID doc in turtle. All is going very well till I try to look for triples based on a # IRI.

When I try and do this line (full code ref below)

vds.DownloadURL = getObject(g, triples[triple].Subject, rdf2go.NewResource("http://www.w3.org/ns/dcat#downloadURL"))

It doesn't work since of course everything after # is effectively ignored which is of course correct in many cases. Still, in SPARQL I can set up a query and use a prefix that has a #'s base.

Is there a way to conduct a search in rdf2go with IRIs that have the # structure like in https://github.com/OpenCoreData/ocdGarden/blob/master/GraphUtils/VOIDReader/void.ttl

Code Ref: https://github.com/OpenCoreData/ocdGarden/blob/master/GraphUtils/VOIDReader/main.go

Error parsing text/turtle

Hi, thanks for your great library. Recently I encountered an error parsing turtle with booleans in it. Here is an example to reproduce:

package main

import (
  "fmt"
  "strings"
  "github.com/deiu/rdf2go"
)

func main() {
  g := rdf2go.NewGraph("")
  if err := g.Parse(strings.NewReader(`<s> <p> [ <o> true; <other> <triple> ] .`), "text/turtle"); err != nil {
    panic(err)
  }
  fmt.Println(g)
}

This results in:

panic: Expected object, got Expected ':' while lexing pname%!(EXTRA []interface {}=[]) (type %!s(easylex.TokenType=-2))

How can a prefix be used?

For example:
rdf is the prefix for <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
Therefore, in the .ttl file we should write:

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
...
ont:TACTIC rdf:type owl:Class ;
    neo4voc:name "TACTIC" .

ont:CustomId rdf:type owl:DatatypeProperty ;
    neo4voc:name "CustomId" .

Blank node creation error in deserializing JSON-LD

Reference:
https://github.com/OpenCoreData/ocdGarden/blob/master/JSON-goLD/rdf2goTesting/main.go

Taking a JSON-LD document that contains blank nodes results in an error where all blank nodes get the same ID.

Expect something like

_:b0 <http://schema.org/description> "The Empire State Building is a 102-story landmark in New York City." .
_:b0 <http://schema.org/geo> _:b1 .
_:b0 <http://schema.org/image> <http://www.civil.usherbrooke.ca/cours/gci215a/empire-state-building.jpg> .
_:b0 <http://schema.org/name> "The Empire State Building" .
_:b1 <http://schema.org/latitude> "40.75"^^<http://www.w3.org/2001/XMLSchema#float> .
_:b1 <http://schema.org/longitude> "73.98"^^<http://www.w3.org/2001/XMLSchema#float> .

Get

_:n0 <http://schema.org/description> "The Empire State Building is a 102-story landmark in New York City."^^<http://www.w3.org/2001/XMLSchema#string> .
_:n0 <http://schema.org/geo> _:n0 .
_:n0 <http://schema.org/image> <http://www.civil.usherbrooke.ca/cours/gci215a/empire-state-building.jpg> .
_:n0 <http://schema.org/name> "The Empire State Building"^^<http://www.w3.org/2001/XMLSchema#string> .
_:n0 <http://schema.org/latitude> "40.75"^^<http://www.w3.org/2001/XMLSchema#float> .
_:n0 <http://schema.org/longitude> "73.98"^^<http://www.w3.org/2001/XMLSchema#float> .

Note the geo line at row 2 in both outputs.
The rightmost blank node can not be _:n0 again.

Also, curious if I load multiple JSON-LD documents into a single graph if the blank nodes will be unique so that subsequent JSON-LD documents don't deserialize with conflicting blank node IDs.

Escaping characters throws an exception

Hello,

There's a problem (bug) in the current library code regarding the escpaction of special characters.
I'm trying to parse a RDF literal (string) which has dobule slash: "aaa\\bbb".
As a result of that, an exception is being thrown: panic: strconv.ParseInt: parsing "ser": invalid syntax

Program's code:

package main

import (
	"github.com/deiu/rdf2go"
	"log"
	"os"
)

func main() {
	if err := convertTtlToJsonLd(); err != nil {
		log.Fatalln(err)
	}
}

func convertTtlToJsonLd() error {
	r, _ := os.OpenFile("test.ttl", os.O_CREATE|os.O_RDONLY, 0664)
	w, _ := os.OpenFile("test.json", os.O_CREATE|os.O_WRONLY, 0644)
	g := rdf2go.NewGraph("https://oxfordsemantic.tech/RDFox/getting-started/")
	if err := g.Parse(r, "text/turtle"); err != nil {
		return err
	}
	return g.Serialize(w, "application/ld+json")
}

RDF (Turtle) file - test.ttl:

@prefix : <https://oxfordsemantic.tech/RDFox/getting-started/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfox: <http://oxfordsemantic.tech/RDFox#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix swrl: <http://www.w3.org/2003/11/swrl#> .
@prefix swrlb: <http://www.w3.org/2003/11/swrlb#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

:Username :Asset_account :Account_159 ;
    :Str_username "w10apps01\\user" ;
    rdf:type :Username .

Exception being thrown:

panic: strconv.ParseInt: parsing "ser": invalid syntax

goroutine 1 [running]:
github.com/deiu/gon3.unescapeUChar({0xc0001c41f0?, 0x12a0120?})
        /Users/bora/go/pkg/mod/github.com/deiu/[email protected]/rdf.go:208 +0x2be
github.com/deiu/gon3.lexicalForm({0xc0001c41ef, 0x11})
        /Users/bora/go/pkg/mod/github.com/deiu/[email protected]/rdf.go:155 +0xd2
github.com/deiu/gon3.(*Parser).parseRDFLiteral(0xc000129e68?)
        /Users/bora/go/pkg/mod/github.com/deiu/[email protected]/parser.go:560 +0x7e
github.com/deiu/gon3.(*Parser).parseLiteral(0xc000129e68?)
        /Users/bora/go/pkg/mod/github.com/deiu/[email protected]/parser.go:508 +0x5e
github.com/deiu/gon3.(*Parser).parseObject(0xc000129e68)
        /Users/bora/go/pkg/mod/github.com/deiu/[email protected]/parser.go:469 +0x9c5
github.com/deiu/gon3.(*Parser).parseObjectList(0xc000129e68?)
        /Users/bora/go/pkg/mod/github.com/deiu/[email protected]/parser.go:381 +0x25
github.com/deiu/gon3.(*Parser).parsePredicateObjectList(0xc000129e68?)
        /Users/bora/go/pkg/mod/github.com/deiu/[email protected]/parser.go:344 +0xa9
github.com/deiu/gon3.(*Parser).parseTriples(0xc000129e68)
        /Users/bora/go/pkg/mod/github.com/deiu/[email protected]/parser.go:273 +0xb8
github.com/deiu/gon3.(*Parser).parseStatement(0x1343660?)
        /Users/bora/go/pkg/mod/github.com/deiu/[email protected]/parser.go:168 +0x105
github.com/deiu/gon3.(*Parser).Parse(0xc000129e68, {0x1343660?, 0xc000010230?})
        /Users/bora/go/pkg/mod/github.com/deiu/[email protected]/parser.go:51 +0x11b
github.com/deiu/rdf2go.(*Graph).Parse(0xc00007dc50, {0x1343660, 0xc000010230}, {0x12c8083?, 0x300000002?})
        /Users/bora/go/pkg/mod/github.com/deiu/[email protected]/graph.go:201 +0x2f7
main.convertTtlToJsonLd()
        /Users/bora/converter/main.go:19 +0x1c7
main.main()
        /Users/bora/converter/main.go:10 +0x19

Process finished with the exit code 2

deiu / rdf2go Goto Github PK

rdf2go's People

Contributors

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Watchers

Forkers

rdf2go's Issues

rdf2go usage with SMW?

Convert TTL or JSON-LD to GO struct

IterTriples causes concurrent map error

Working with # IRI

Error parsing text/turtle

How can a prefix be used?

Blank node creation error in deserializing JSON-LD

Escaping characters throws an exception

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