WOLFRAM

Wolfram Language & System Documentation Center

Background

Import & Export

Import Elements

Options

Examples  
Basic Examples  
See Also
GraphStore`

Turtle (.ttl)

Background

Import & Export

  • Import["file.ttl"] imports a Turtle file, returning an RDFStore.
  • Import["file.ttl",elements] imports the specified elements.
  • Export["file.ttl",expr] exports an RDFStore to a Turtle file.

Import Elements

  • General Import elements:
  • "Elements" list of elements and options available in this file
    "Rules"full list of rules for each element and option
    "Options"list of rules for options, properties and settings
  • Data representation elements:
  • "Data"an RDFStore
    "Base"base IRI used to resolve relative IRIs
    "Prefixes"association of prefixes to namespace IRIs

Options

  • Import options:
  • "Base"Automaticbase IRI used to resolve relative IRIs
  • The value of "Base" is only used if the file does not specify a base IRI.
  • "Base" can take the following values:
  • Automaticthe file name of the imported file
    Noneno base IRI
    "iri" or URL["iri"]an IRI
  • Export options:
  • "Base"Noneproduce IRIs relative to this base
    "Prefixes"<||>produce prefixed names using these prefixes
  • A prefixed name has the form pre:local. The corresponding IRI is obtained by joining the namespace IRI associated with the prefix pre with the local part local.
  • "Base" and "Prefixes" can be used to shorten an exported file. These options do not change the meaning of the RDFStore that the file represents.

Examples

Basic Examples  (1)

Wolfram Language code: Needs["GraphStore`"]

Import a recipe in the Turtle format:

Wolfram Language code: recipeGraph = ImportString[" PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX time: <http://www.w3.org/2006/time#> PREFIX fo: <http://purl.org/ontology/fo/> PREFIX ex: <http://example.org/> ex:riceWithMushrooms a ex:recipe ; rdfs:label \"rice with mushrooms\" ; fo:ingredients (ex:rice ex:mushroom ex:oil ex:water ex:salt ex:pepper) ; ex:step ex:heatOil , ex:fryMushroom , ex:cookRice , ex:mixRiceAndMushroom . ex:cookRice time:minutes 10 . ex:mixRiceAndMushroom time:after ex:fryMushroom , ex:cookRice . ex:fryMushroom time:after ex:heatOil ; time:minutes 7 . ", "Turtle"]

List the ingredients:

Wolfram Language code: rdf[s_] := URL["http://www.w3.org/1999/02/22-rdf-syntax-ns#" <> s]; fo[s_] := URL["http://purl.org/ontology/fo/" <> s]; ex[s_] := URL["http://example.org/" <> s];
Wolfram Language code: recipeGraph//SPARQLSelect[SPARQLPropertyPath[ex["riceWithMushrooms"], {fo["ingredients"], rdf["rest"]..., rdf["first"]}, SPARQLVariable["ingredient"]]]