[jira] [Resolved] (STANBOL-409) LDPath RDFBackend implementations for the Entityhub

["Rupert Westenthaler (Resolved) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/STANBOL-409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rupert Westenthaler resolved STANBOL-409.
-----------------------------------------

    Resolution: Fixed

With Revision #1210685 RDFRepository for Yard, ReferencedSite, ReferencedSiteManager and Entityhub where added. In addition an implementation that can use Representations already retrieved by a query was added.

For Examples how to use the new API see the UnitTest "BackendTest":

Especially the new possibility to follow inverse properties is interesting because it allows to select inverse properties for Entities:

The unit test uses an Example for the DBPedia Category "Category:Harvard_University_alumni"

LDPath Program:

    name = rdfs:label :: xsd:string;
    parent = skos:broader :: xsd:anyURI;
    childs = ^skos:broader :: xsd:anyURI;
    members = ^<http://purl.org/dc/terms/subject> :: xsd:anyURI;

The Representation as stored in the Entityhub

    skos:broader:[dbpedia:Category:Harvard_University_people, 
        dbpedia:Category:Alumni_by_university_or_college_in_Massachusetts, 
        dbpedia:Category:Ivy_League_alumni]
    rdfs:type:[http://www.w3.org/2004/02/skos/core#Concept]
    entityRank:[0.66937166]
    rdfs:abel:[Harvard University alumni@en]
    skos:prefLabel:[Harvard University alumni@en]

As one can see members and child categories are not stored with categories. However the "^{property}" statement of LDPath allows to retrieve them.

    name: [Harvard University alumni]
    parent: [dbpedia:Category:Harvard_University_people, 
        dbpedia:Category:Alumni_by_university_or_college_in_Massachusetts, 
        dboedia:Category:Ivy_League_alumni]
    childs: [dbpedia:Category:John_F._Kennedy_School_of_Government_alumni, 
        dbpedia:Category:Harvard_Law_School_alumni, 
        dbpedia:Category:Harvard_Medical_School_alumni, 
        dbpedia:Category:Harvard_Business_School_alumni]
    members: [dbpedia:Edward_Said, dbpedia:Norman_Mailer, dbpedia:John_Lithgow, 
        dbpedia:John_Quincy_Adams, [.. and manny more ..]

                
> LDPath RDFBackend implementations for the Entityhub
> ---------------------------------------------------
>
>                 Key: STANBOL-409
>                 URL: https://issues.apache.org/jira/browse/STANBOL-409
>             Project: Stanbol
>          Issue Type: Sub-task
>          Components: Entity Hub
>            Reporter: Rupert Westenthaler
>            Assignee: Rupert Westenthaler
>
> LDPath requires the implementation of the RDFBackend interface so that it can query data within an entity source. The plan is to provide implementation of this interface for the following Entityhub Interfaces:
> * Yard: This is mainly interesting because Yard implementations typically do not require an OSGI environment.
> * ReferencedSite
> * ReferencedSiteManater: to use LDPath over all referenced sites
> * Entityhub

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