How to add properties to nodes and edges?

[novas...@gmail.com]

Hello everyone,

I have some experience with RDF and with the property graph Neo4j. I understand that Stardog supports properties on both edges and nodes and this feature is one of the reasons I am investigating Stardog.

It is unclear from my reading the manual (Stardog 4.2) how to add property:value pairs to RDF nodes and edges. Is there a tutorial available? 

For example, let's say I have the following loaded into Stardog as RDF:

Tim --- WORKS_AT ---> BurgerKing

I want to add a hire date to the WORKS_AT edge and a street address to the Burger King company node.  How do I approach this very basic task?

Please let me know if this is not the appropriate forum for this type of question (I'm new here!).

Cheers,

Tim  

[Pavel Klinov]

Hi Tim,

You can add properties to nodes simply by adding RDF triples. In your example :BurgerKing :address "some address" would just be a triple in the RDF data model which you can add to your database using CLI [1], Java API [2], or HTTP API [3]. 

To add properties to edges, you have to use the TinkerPop API with Stardog [4] because that isn't natively supported in RDF. In addition to using the API from your Java code, you can experiment using the Gremlin Console [5].

Cheers,

Pavel

[1] http://docs.stardog.com/man/data-add.html

[2] http://docs.stardog.com/#_java_programming

[3] http://docs.stardog.com/#_network_programming

[4] http://docs.stardog.com/#_property_graphs

[5] http://docs.stardog.com/#_stardog_gremlin_console

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[Evren Sirin]

If your goal is not using the TinkerPop API and/or gremlin then an
alternative is to use named graphs in RDF as triple identifiers and
then attach properties to those identifiers.

Tim WORKS_AT BurgerKing Stmt1.
Stmt1 startDate "..." .

Then you can use the GRAPH keyword in SPARQL to query these "edge properties".

SELECT * {
GRAPH ?id { Tim WORKS_AT BurgerKing }
?id startDate ?date
}

Best,
Evren

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[novas...@gmail.com]

Thanks to both Pavel and Evren for these details. I am not yet familar with TinkerPop. In RDF's current specification it appears that I cannot avoid expanding the graph when I want to describe properties of the edges, by having the edge become the subject of an additional triple for things like time-stamping an edge.  I will investigate further.

Thanks again,

Tim