The vocabulary is published at is namespace http://w3id.org/pkg/ .
The sources are available at https://github.com/iai-group/pkg-vocabulary .
The PKG Vocabulary is defined by a set of SHACL shapes patterns definition over largely well-established vocabularies:
- Statements are represented by RDF’s reification vocabulary (https://www.w3.org/TR/rdf11-schema/#ch_reificationvocab)
- with additional provenance, authoring and versioning data (using the PAV ontology (https://pav-ontology.github.io/pav/)),
- and the possibility of assigning preferences to statements (using the Weighting Ontology and The Weighted Interests Vocabulary (http://purl.org/ontology/wo/core , http://purl.org/ontology/wi/core)).
- Complex values are recommended expressed using SKOS’ (http://www.w3.org/2004/02/skos/core) Concepts following the
pkg:ConceptShapepattern.
@prefix my: <http://example.com/my> .
_:st1 a rdf:Statement ;
## CONTENT
## The original textual statement in full.
dc:description
"I dislike all movies with the actor Tom Cruise."@en ;
## The statement is split into a subject, predicate and object.
## Here, my:I represents the owner of the PKG.
rdf:subject
my:I ;
## No readily available IRI for "dislike" was found, so we represent
## this as a skos:Concept where the term(s) that represent the
## meaning of the concept should be included as a textual
## description using `dc:description`.
rdf:predicate [ a skos:Concept ; dc:description "dislike" ] ;
## Complex statements are also typically represented using
## skos:Concept, which can be additionally related to other concepts
## using the SKOS properties: skos:related, skos:broader,
## skos:narrower --- or other applicable properties.
rdf:object
[
a skos:Concept ; dc:description "All movies with the actor Tom Cruise" ;
skos:related <https://schema.org/actor>, <http://dbpedia.org/resource/Tom_Cruise> ;
skos:broader <https://schema.org/Movie> ;
] ;
## LOGGING
# Who made the original statement?
pav:authoredBy
my:I ;
# Who created this representation of the statement?
pav:createdBy
my:I ;
# Who helped in further describing/analysing the statement?
# pav:curatedBy
# When was the original statement made/expressed/uttered?
pav:authoredOn
"2023-12-15T21:12:40"^^xsd:dateTime ;
# When this representation was made?
pav:createdOn
"2023-12-15T21:12:40"^^xsd:dateTime ;
# Where was this representation was made?
pav:createdAt
[ a geo:Point ;
geo:lat 45.201 ;
geo:long 10.128
] ;
pkg:readAccessRights "MovieBot", "IMDB" ;
pkg:writeAccessRights "MovieBot" ;
.
## FURTHER ANALYSIS
## A statement may be analysed in more details in terms of preference disclose.
## In our example, it is possible to derive I's negative preference towards Tom Cruise.
my:I wi:preference [
pav:derivedFrom _:st1 ;
wi:topic <http://dbpedia.org/resource/Tom_Cruise> ;
wo:weight [
wo:weight_value -1.0 ;
wo:scale pkg:StandardScale
]
]
.
pkg:PKGVocabulary a owl:Ontology ;
dc:title "Personal Knowledge Graph (PKG) Vocabulary" ;
vann:preferredNamespacePrefix "pkg" ;
vann:preferredNamespaceUri "http://w3id.org/pkg/" ;
#owl:priorVersion
owl:versionIRI <> ;
owl:versionInfo "0.1.0" ;
dcat:distribution
[ dc:format <https://www.iana.org/assignments/media-types/text/turtle> ;
dcat:downloadURL <pkg-vocabulary.shacl.ttl> ] ;
# [ dc:format <https://www.iana.org/assignments/media-types/application/ld+json> ;
# dcat:downloadURL <....json> ]
doap:repository <https://github.com/iai-group/pkg-vocabulary> ;
dc:creator "Martin G. Skjæveland" ;
dc:contributor "Krisztian Balog", "Nolwenn Bernard" , "Petra Galuscakova" ;
dc:created "2024-01-04" ;
dc:issued "2023-02-05" ;
#dc:modified "2023-09-26" ;
dc:abstract """
The PKG Vocabulary defines a pattern for expressing reified statements
that may be annotated with provenance data. The vocabulary is designed
to express facts and statements for personal knowledge graphs
(PKGs), that is, facts and statements where personalisation data, e.g.,
who made the statement, who the statement is about, is at the core.
Statements are represented by
[RDF's reification vocabulary](https://www.w3.org/TR/rdf11-schema/#ch_reificationvocab)
with additional provenance, authoring and versioning data (using the
[PAV ontology](https://pav-ontology.github.io/pav/)),
and the possibility of assigning preferences to statements (using the
[Weighting Ontology](http://purl.org/ontology/wo/core)). Complex values are
recommended expressed using SKOS' `Concepts` following the `pkg:ConceptShape` pattern.
""" ;pkg:StatementShape a sh:NodeShape ;
sh:targetClass rdf:Statement ;
# skos:definition """ """ ;
# skos:changeNote
skos:example <example/ex1.ttl> ;
sh:order 1;
sh:property
# Logging
[ sh:path pav:authoredBy ; sh:minCount 0 ;
sh:name "Authored by" ; sh:order 3.1 ;
sh:description "Who made the original statement?" ] ,
[ sh:path pav:createdBy ; sh:minCount 0 ;
sh:name "Created by" ; sh:order 3.2 ;
sh:description "Who made this representation of the statement?" ] ,
[ sh:path pav:curatedBy ; sh:minCount 0 ;
sh:name "Created by" ; sh:order 3.3 ;
sh:description "Who helped in further describing or analysing this representation of the statement?" ] ,
[ sh:path pav:authoredOn ; sh:minCount 0 ; sh:maxCount 1 ;
sh:name "Authored on" ; sh:order 3.4 ;
sh:datatype xsd:dateTime ;
sh:description "The timestamp when the statement was made." ] ,
[ sh:path pav:createdOn ; sh:minCount 0 ; sh:maxCount 1 ;
sh:name "Authored on" ; sh:order 3.5 ;
sh:datatype xsd:dateTime ;
sh:description "The timestamp when this representation of the statement was made." ] ,
[ sh:path pav:createdAt ; sh:minCount 0 ;
sh:name "Authored on" ; sh:order 3.6 ;
sh:description "The location where this representation of the statement was made." ] ,
# content
[ sh:path dc:description ; sh:minCount 1 ; sh:maxCount 1 ; sh:nodeKind sh:Literal ;
sh:name "Description" ; sh:order 1.1 ;
sh:description "The original textual statement in full." ] ,
[ sh:path rdf:subject ; sh:minCount 1 ; sh:maxCount 1 ; sh:nodeKind sh:BlankNodeOrIRI ; sh:node pkg:StatementValueShape ;
sh:name "Subject" ; sh:order 1.2 ;
sh:description """The subject of the statement.
Typically who or what that is performing the action of the statement.
The first value of the elements in a RDF triple representation.""" ] ,
[ sh:path rdf:predicate ; sh:minCount 1 ; sh:maxCount 1 ; sh:nodeKind sh:BlankNodeOrIRI ; sh:node pkg:StatementValueShape ;
sh:name "Predicate" ; sh:order 1.3 ;
sh:description """The predicate of the statement.
Typically the action of the statement.
The second value of the elements in a RDF triple representation.""" ] ,
[ sh:path rdf:object ; sh:minCount 1 ; sh:maxCount 1 ; sh:node pkg:StatementValueShape ;
sh:name "Object" ; sh:order 1.4 ;
sh:description """The object of the statement.
Typically the receiver of the statements' action.
The third value of the elements in a RDF triple representation.""" ] ,
# weight
[ sh:path wo:weigth ; sh:minCount 0 ; sh:maxCount 1 ; sh:node pkg:WeightShape ;
sh:name "Weigth" ; sh:order 2.1 ;
sh:description """
""" ] ,
# access
[ sh:path pkg:readAccessRights ; sh:minCount 0 ;
sh:name "Read access" ; sh:order 4.1 ;
sh:description "Who has read access to the statement?" ] ,
[ sh:path pkg:writeAccessRights ; sh:minCount 0 ;
sh:name "Write access" ; sh:order 4.2 ;
sh:description "Who has write access to the statement?" ]
.
pkg:StatementValueShape a sh:NodeShape ;
sh:targetObjectsOf rdf:subject, rdf:predicate, rdf:object ;
sh:order 2;
rdfs:comment """
The subject, predicate and object of a statement can be given as a
single IRI or literal, e.g., ex:JurassicPark or 'Tom Hanks', as long
as this respects the RDF grammar, e.g., literals should only appear as
objects. In case the value may not be identified by a single concrete
IRI or literal, the value can be expressed as a skos:Concept, in
particular for cases where the value represents a complex value, e.g.,
'all the flowers in my garden'.
"""
.pkg:ConceptShape a sh:NodeShape ;
sh:targetClass skos:Concept ;
sh:order 3;
sh:property
[ sh:path dc:description ; sh:minCount 1 ; sh:maxCount 1; sh:nodeKind sh:Literal ;
sh:name "Description" ; sh:order 1.1 ;
sh:description "The textual support in the original statement for this concept." ] ,
[ sh:path [ sh:alternativePath ( skos:related skos:narrower skos:broader ) ] ; sh:minCount 0 ;
sh:name "Related concepts" ; sh:order 1.2 ;
sh:description """
Any things or concepts related to this concept. Use this relation for
linking identified named entities to this concept. For
non-hierarchically related things or concepts, use skos:related. For
hierarchically related things or concepts, use skos:narrower or
skos:broader.
""" ]
.
pkg:PreferenceShape a sh:NodeShape ;
rdfs:comment "Preference is used to express the sentiment of the Subject of the statement toward its Object. The sentiment is represented as a bounded weight, e.g., like is 1 and dislike is -1." ;
sh:order 4;
sh:targetObjectsOf wi:preference ;
sh:property
[ sh:path wi:topic ; sh:minCount 1 ;
sh:name "Preference topic" ; sh:description "The topic of the preference." ;
sh:order 1 ;
] ,
[ sh:path wo:weight ; sh:minCount 1 ; sh:maxCount 1 ;
sh:name "Weigth value" ; sh:description "The specific value of a weight." ;
sh:order 2 ;
] ,
[ sh:path pav:derivedFrom ; sh:minCount 0 ; sh:node pkg:StatementShape ;
sh:name "Weigth scale" ; sh:description "The statement from which the preference was derived." ;
sh:order 3 ;
] .pkg:WeightShape a sh:NodeShape ;
sh:order 5;
sh:targetObjectsOf wo:weight ;
sh:property
[ sh:path wo:weight_value ; sh:minCount 1 ; sh:maxCount 1 ; sh:datatype xsd:decimal ;
sh:name "Weight value" ; sh:description "The maximum value of this scale" ;
sh:order 1
] ,
[ sh:path wo:scale ; sh:minCount 1 ; sh:maxCount 1 ; sh:node pkg:WeightScaleShape ;
sh:name "Min weight" ; sh:description "The minimum value of this scale" ;
sh:order 2
]
.pkg:WeightScaleShape a sh:NodeShape ;
sh:order 5;
sh:targetClass wo:Scale ;
sh:property
[ sh:path wo:max_weigth ; sh:minCount 1 ; sh:maxCount 1 ; sh:datatype xsd:decimal ;
sh:name "Max weight" ; sh:description "The maximum value of this scale" ;
sh:order 2
] ,
[ sh:path wo:min_weigth ; sh:minCount 1 ; sh:maxCount 1 ; sh:datatype xsd:decimal ;
sh:name "Min weight" ; sh:description "The minimum value of this scale" ;
sh:order 1
] ,
[ sh:path wo:step_size ; sh:minCount 0 ; sh:maxCount 1 ; sh:datatype xsd:decimal ;
sh:name "Step size" ; sh:description "The step size of this scale. Values should be a multiple of this step size offset from the minimum weight." ;
sh:order 3
]
.pkg:StandardScale a wo:Scale ;
dc:description "A standard scale from -1 to 1 with 0.1 steps.";
wo:max_weigth 1.0 ;
wo:min_weigth -1.0 ;
wo:step_size 0.1 .pkg:readAccessRights rdfs:subPropertyOf dc:accessRights ;
rdfs:domain rdf:Statement ;
dc:description "Who has read access to the statement?"
.
pkg:writeAccessRights rdfs:subPropertyOf dc:accessRights ;
rdfs:domain rdf:Statement ;
dc:description "Who has write access to the statement?"
.<<prefixes>>
@base <http://w3id.org/pkg/0.1.0/> .
<<voc-metadata>>
dc:description """
### Example 1
This example demonstrates how the statement "I dislike all movies with
the actor Tom Cruise." is represented using the vocabulary. The
statement is expressed/uttered by the owner of the PKG, represented by
the IRI `my:I`. The example includes comments inline.
```
<<example1-tom-cruise>>
```
"""
;
#skos:changeNote .
.
###
### SHACL SHAPES
###
<<voc-shacl-pattern-statement>>
<<voc-shacl-pattern-statementvalue>>
<<voc-shacl-pattern-concept>>
<<voc-shacl-pattern-preference>>
<<voc-shacl-pattern-weight>>
<<voc-shacl-pattern-weight-scale>>
###
### VOCABULARY TERMS
###
<<voc-terms-standardscale>>
<<voc-terms-accessRights>>
<<prefixes>>
<<voc-terms-standardscale>>
<<voc-terms-accessRights>>
@prefix dc: <http://purl.org/dc/terms/> .
@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix doap: <http://usefulinc.com/ns/doap#> .
@prefix event: <http://purl.org/NET/c4dm/event.owl#> .
@prefix ex: <http://example.com#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix geo: <http://www.w3.org/2003/01/geo/wgs84_pos#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix pav: <http://purl.org/pav/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix sh: <http://www.w3.org/ns/shacl#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix vann: <http://purl.org/vocab/vann/> .
@prefix vs: <http://www.w3.org/2003/06/sw-vocab-status/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix wi: <http://purl.org/ontology/wi/core#> .
@prefix wo: <http://purl.org/ontology/wo/core#> .
@prefix pkg: <http://w3id.org/pkg/> .