DebugQueries
This page contains several SPARQL-Queries to help debug the graph.
Useful Queries
A List of accessible queries, that are useful to understand the structure of the graph and identify problems, such as missing links. They can be changed as needed.
Backlinks
A query that finds all backlinks to a specific item.
Items used: GLSL (Q61)
Properties used: depends on (P1)
PREFIX wdt: <https://graphit.ur.de/prop/direct/>
PREFIX wd: <https://graphit.ur.de/entity/>
SELECT DISTINCT ?source ?sourceLabel
WHERE {
?source wdt:P1 wd:Q61.
service wikibase:label { bd:serviceParam wikibase:language "en". }
}
Missing Properties
Resources
No Resources
Returns all Items, that don't have any resource that they link to.
Unlinked Resources
Returns all resources, that have not been linked to any item yet.
Instance-less Resources
Returns all Resources that have no Property instance of.
No Subclass
Returns all Items, that don't have a property subclass.
No Dependencies
Returns all Items, that don't link any other items as dependency.
These items don't have a property depends on. This could mean, that they are a source or that they are orphaned.
Orphans
Returns all items, that don't link to any other items and are not linked to in return.
NOTE: Not sure if this works.
No Description
Returns all items without a description.
Access to Items
Queries that find items with specific proterties for an easier overview.
Quizzes
Returns all Items that are Quizzes.
Resources
Returns all Resources.