How can I check property list that a class has in DBPedia ontology? Is the service(http://mappings.dbpedia.org) down?

#1

Nice to meet you. I want to use classes in DBPedia ontlogy. Specifically, I want to get the list of classes and the list of properties that the classes have.
Previously, the list of classes (hierarchy) could be confirmed with this URL(http://mappings.dbpedia.org/server/ontology/classes/), but now it is inaccessible due to a 503 server error. Similarly, I was able to check the property list of the class at the URL, but this is also unavailable.

At least, I found a solution about the class list by writing the following SPARQL.

prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
select ?subclass ?superclass where {
  ?subclass rdfs:subClassOf ?superclass
}

However, how do I get the list of properties that a class has?
For example, I was able to confirm from the above URL that the ComicsCreator class has properties such as “academyAward” like this images.

範囲を選択_999(064)
範囲を選択_999(064)882×671 112 KB

However, in this URL(http://live.dbpedia.org/ontology/ComicsCreator) that can be confirmed now, the property “academyAward” does not exist.

#2

Welcome @kondo,
http://mappings.dbpedia.org/server/ontology/classes/ is quite old and became unstable. Over the last month, we redployed a new version of this service under http://dief.tools.dbpedia.org/server/
Please use this for now.

http://mappings.dbpedia.org/server will either redirect to http://dief.tools.dbpedia.org/server/ soon or proxy it.

Regarding your question:
http://live.dbpedia.org/ontology/ComicsCreator -> these onto pages do not have that. It is only viewable via dief.tools.dbpedia.org/server

Also:

SELECT Distinct ?p count(?p) as ?count 
{
 ?s a dbo:ComicsCreator. 
 ?s ?p ?o
 } ORDER by DESC(?count)

Otherwise, maybe use + , * as well:

select  ?superclass where {
  dbo:ComicsCreator rdfs:subClassOf* ?superclass
}

DBpedia Live will also upgrade soon: https://www.dbpedia.org/resources/live/dbpedia-live-2-0/

#3

Thanks a lot! The new version of service is quite nice.
Your advice is very helpful for me.

And, thank you for teaching me the SPARQL.
I could check properties by using it. I appreciate you.

#4

I’m grateful for all your help.
Can I ask two more questions about getting properties?

Question 1:
I got the properties of dbo:ComicsCreator by executing the SPARQL.
Then how can I get the type of the properties?
For example, I guess the type of the property ‘name’ in dbo:ComicsCreator should be ‘string’. But in this following page I couldn’t find the type.
http://dbpedia.org/property/name

dbo:ComicsCreator has the property ‘birthPlace’. I couldn’t find the type ‘Place’ in this page.
https://dbpedia.org/property/birthPlace

Question 2:

And, I checked properties of DBPedia ontology class ‘dbo:TimePeriod’ by modifying the SPARQL.

SELECT Distinct ?p count(?p) as ?count 
{
 ?s a dbo:TimePeriod. 
 ?s ?p ?o
 } ORDER by DESC(?count)

I think it is natural that the class ‘dbo:TimePeriod’ has the property http://dbpedia.org/property/termEnd. However, the result indicates that the class can have http://dbpedia.org/property/awards. I think it may be strange. Is the property list correct?