Hi Daniel,
some comments:
- I dont think you need special description and title properties. Just
use the ones in NIE
- Try reusing publisher and author from other ontos like NMM or the
publishing onto from Jörg
- Can't you create sub-classes to nso:Enclosure instead of using nso:type?
Also note that the semantic web uses atom[1] and sioc[2] for feeds.
Cheers,
Sebastian
[1] http://bblfish.net/work/atom-owl/2006-06-06/AtomOwl.html
[2] http://sioc-project.org/ontology
On 01/22/2013 04:10 PM, Daniel Vrátil wrote:
Hi folks,
I'm working on support for Nepomuk search in Akregator2. I have not found any
suitable ontology for indexing RSS articles, so I made an attempt to write one
myself.
I have no previous experience with writing ontologies, so I would appreciate
if you could take a look and review the ontology:
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix nao: <http://www.semanticdesktop.org/ontologies/2007/08/15/nao#> .
@prefix nco: <http://www.semanticdesktop.org/ontologies/2007/03/22/nco#> .
@prefix nrl: <http://www.semanticdesktop.org/ontologies/2007/08/15/nrl#> .
@prefix nie: <http://www.semanticdesktop.org/ontologies/2007/01/19/nie#> .
@prefix nmo: <http://www.semanticdesktop.org/ontologies/2007/01/19/nmo#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
@prefix nso: <http://www.kde.org/ontologies/nso#> .
nso: {
nso:Element a rdfs:Class ;
rdfs:label "Feed Element" ;
rdfs:comment "Superclass for all elements related to RSS feeds" ;
rdfs:subClassOf nie:InformationElement .
nso:Feed a rdfs:Class ;
rdfs:comment "Represents an RSS Feed" ;
rdfs:label "RSS Feed" ;
rdfs:subClassOf nso:Element .
nso:Article a rdfs:Class ;
rdfs:label "RSS Article" ;
rdfs:comment "Represents a single article within an RSS Feed" ;
rdfs:subClassOf nso:Element .
nso:Enclosure a rdfs:Class ;
rdfs:label "RSS Enclosure" ;
rdfs:subClassOf nso:Element .
# Properties of nso:Element
nso:sourceUrl a rdf:Property ;
rdfs:label "Source URL" ;
rdfs:comment "URL of the source" ;
rdfs:subPropertyOf dc:source ;
rdfs:range xsd:string ;
rdfs:domain nso:Element .
nso:title a rdf:Property ;
rdfs:label "Title" ;
rdfs:comment "Title of the element" ;
rdfs:subPropertyOf nie:title ;
rdfs:range xsd:string ;
rdfs:domain nso:Element .
# Properties of nso:Feed
nso:publisher a rdf:Property ;
rdfs:label "Publisher" ;
rdfs:comment "Publisher of the feed" ;
rdfs:range nco:Contact ;
rdfs:domain nso:Feed .
# Properties of nso:Article
nso:content a rdf:Property ;
rdfs:label "Content" ;
rdfs:comment "Content of the article" ;
rdfs:subPropertyOf nie:htmlContent ;
rdfs:range xsd:stirng ;
rdfs:domain nso:Article .
nso:description a rdf:Property ;
rdfs:label "Description" ;
rdfs:comment "Description of article content" ;
rdfs:subPropertyOf nie:description ;
rdfs:range xsd:string ;
rdfs:domain nso:Article .
nso:publishTime a rdf:Property ;
rdfs:label "Publish Time" ;
rdfs:comment "Date when the article was first published in the feed" ;
rdfs:subPropertyOf dc:date ;
rdfs:range xsd:dateTime ;
rdfs:domain nso:Article .
nso:updateTime a rdf:Property ;
rdfs:label "Update Time" ;
rdfs:comment "Date when the article was last updated in the feed" ;
rdfs:subPropertyOf dc:date ;
rdfs:range xsd:dateTime ;
rdfs:domain nso:Article .
nso:author a rdf:Property ;
rdfs:label "Author" ;
rdfs:comment "Author of the article" ;
rdfs:range nco:Contact ;
rdfs:domain nso:Article .
nso:enclosure a rdf:Property ;
rdfs:label "Enclosure" ;
rdfs:comment "Enclosure related to the article" ;
rdfs:range nso:Enclosure ;
rdfs:domain nso:Article .
nso:isRead a rdf:Property ;
nrl:maxCardinality 1 ;
rdfs:label "Is Read" ;
rdfs:comment "A flag that state whether the item has been read" ;
rdfs:range xsd:boolean ;
rdfs:domain nso:Article .
# Properties of nso:Enclosure
nso:type a rdf:Property ;
nrl:maxCardinality "1" ;
rdfs:label "Enclosure type" ;
rdfs:comment "Describes type of the enclosure" ;
rdfs:range xsd:string ;
rdfs:domain nso:Enclosure .
nso:length a rdf:Property ;
nrl:maxCardinality "1" ;
rdfs:label "Length" ;
rdfs:comment "Length of audio enclosure (podcast)" ;
rdfs:range xsd:integer ;
rdfs:domain nso:Enclosure .
}
<http://www.kde.org/ontologies/nso_metadata#> {
<http://www.kde.org/ontologies/nso_metadata#> a nrl:GraphMetadata ;
nrl:coreGraphMetadataFor nso: .
nso: a nrl:Ontology ;
nao:hasDefaultNamespace "http://www.kde.org/ontologies/nso#"; ;
nao:hasDefaultNamespaceAbbreviation "nso" ;
nao:lastModified "2013-01-20T22:57:45.656Z" ;
nao:serializationLanguage "TriG" ;
nao:status "Unstable" ;
nao:updatable "0 " ;
nao:version "2" ;
nao:prefLabel "Nepomuk Syndication Ontology" ;
nao:description "The Nepomuk Syndication Ontology extends the Nepomuk
Information Element framework into the domain of Web Syndication" .
}
Thanks
Dan
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