Qlever provides an alternative to the Blazegraph GAS service. The Qlever path search service provides similar features. Users of WDQS should be able to use this service. The current implementation of the wdqs-proxy rejects these queries like the following
PREFIX pathSearch: <https://qlever.cs.uni-freiburg.de/pathSearch/>
SELECT ?start ?end ?path ?edge WHERE {
SERVICE pathSearch: {
_:path pathSearch:algorithm pathSearch:allPaths ; # Specify the algorithm
pathSearch:source <sourceNode> ; # Specify the source node(s)
pathSearch:target <targetNode> ; # Specify the target node(s)
pathSearch:pathColumn ?path ; # Bind the path variable
pathSearch:edgeColumn ?edge ; # Bind the edge variable
pathSearch:start ?start ; # Bind the edge start variable
pathSearch:end ?end ; # Bind the edge end variable
{SELECT * WHERE {
?start <predicate> ?end. # Define the edge pattern
}}
}
}due to it being filtered by the federation allow list.
Support for Qlever's path search feature should be configurable.
AC:
- pathSearch are correctly forwarded to QLever.
- maxDepth` is limited to 5, while analysis to determine an appropriate threshold is concluded (T429833)
Follow up work:
Implement a constraint on max depth of the search once analysis is finalized T429833: Need to determine the maxDepth limit for QLever's pathSearch.