Hi Louis, You might have uploaded the MeSH ontology into the default graph or at least not into a graph with the name `<http://id.nlm.nih.gov/mesh>`.
>From the query editor at https://id.nlm.nih.gov/mesh/query, I see that they have different graphs for each year (current = `<http://id.nlm.nih.gov/mesh>`, 2024 = `<http://id.nlm.nih.gov/mesh/2024>`, and 2023 = `< http://id.nlm.nih.gov/mesh/2023>`). To use the sample queries, you need to upload the data into the dataset using the corresponding names. Fixing the query is not an option if different years have all been uploaded into the same default graph. A glimpse into the data told me that all subjects begin with `http://id.nlm.nih.gov/mesh/`. So, you could filter for a specific year like this: `FILTER(STRSTARTS(STR(?subject), " http://id.nlm.nih.gov/mesh/2024";))`. Unfortunately, this does not work for the current year, as in your example, since `FILTER(STRSTARTS(STR(?subject), "http://id.nlm.nih.gov/mesh/";))` would include all subsequent years. To check your assumption about the default graph and where your data is: In the Fuseki UI, there is the "info" tab for your dataset, where you may click "count triples in all graphs," which gives you a list of all graphs in your dataset, their names, and the corresponding triple count. The following query should provide the same information: ``` SELECT ?graph_name (COUNT(?s) AS ?triples) WHERE { { BIND('default graph' AS ?graph_name) OPTIONAL { ?s ?p ?o. } } UNION { GRAPH ?graph_name { OPTIONAL { ?s ?p ?o. } } } } GROUP BY ?graph_name ``` See also https://jena.apache.org/tutorials/sparql_datasets.html#describing-rdf-datasets---from-and-from-named . I hope this helps. Arne Am Mi., 8. Mai 2024 um 19:23 Uhr schrieb Luis Enrique Ramos García <luisenriqueramos1...@googlemail.com.invalid>: > I uploaded the mesh ontology in fuseki, > but when I try with the query the sample queries recommended in their > documentation: > https://hhs.github.io/meshrdf/sample-queries > > I get no results. > > For instance: > PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> > PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> > PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> > PREFIX owl: <http://www.w3.org/2002/07/owl#> > PREFIX meshv: <http://id.nlm.nih.gov/mesh/vocab#> > PREFIX mesh: <http://id.nlm.nih.gov/mesh/> > PREFIX mesh2015: <http://id.nlm.nih.gov/mesh/2015/> > PREFIX mesh2016: <http://id.nlm.nih.gov/mesh/2016/> > PREFIX mesh2017: <http://id.nlm.nih.gov/mesh/2017/> > SELECT DISTINCT ?p > FROM <http://id.nlm.nih.gov/mesh> > WHERE { > ?s ?p ?o > } > ORDER BY ?p > > It gives me no results, but when I comment out the line with the FROM > clause, I get some results. > > I assume the data with namespace meshv is in the default graph, and the > other data is in a specific named graph, but I am not sure how I have to > write the query to get the data in the named graphs. > > Thanks in advanced > > > Luis Ramos >
